SALIVA DIAGNOSTIC SYSTEMS INC
POS AM, 1997-08-04
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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     As filed with the Securities and Exchange Commission on August 4, 1997
                                                      Registration No. 333-26795


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                     ---------------------------------------

                        POST-EFFECTIVE AMENDMENT NO. 2 TO
                       REGISTRATION STATEMENT ON FORM SB-2
                                FILED ON FORM S-3
                                      UNDER
                           THE SECURITIES ACT OF 1933

                         Saliva Diagnostic Systems, Inc.
             (Exact name of registrant as specified in its charter)

                                    DELAWARE
         (State or other jurisdiction of incorporation or organization)

                                   91-1549305
                      (I.R.S. Employer Identification No.)

                              11719 NE 95th Street
                           Vancouver, Washington 98682
                                 (360) 696-4800
               (Address, including zip code, and telephone number,
        including area code, of registrant's principal executive offices)

                         Kenneth J. McLachlan, President
                         Saliva Diagnostic Systems, Inc.
                              11719 NE 95th Street
                           Vancouver, Washington 98682
                                 (360) 696-4800
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                        Copies of all correspondence to:

                               LaDawn Naegle, Esq.
                                 Bryan Cave LLP
                        700 13th Street, N.W., Suite 700
                           Washington, D.C. 20005-3960
                                 (202) 508-6000

     Approximate  date of commencement of proposed sale to public:  From time to
time after this Registration Statement becomes effective.


<PAGE>

     If the only  securities  being  registered  on this form are being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. [ ]

     If any of the securities being registered on this form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

     If this Form is filed to  register  additional  securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. [ ] __________________

     If this Form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ] _____________________

     If delivery of the  prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]

                      -------------------------------------

     THE REGISTRANT  HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER  AMENDMENT  WHICH  SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT SHALL  THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE  SECURITIES  ACT OF 1933 OR UNTIL THE  REGISTRATION  STATEMENT  SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION,  ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

<PAGE>

                                   PROSPECTUS

                         SALIVA DIAGNOSTIC SYSTEMS, INC.

                        2,457,974 Shares of Common Stock


     Saliva Diagnostic  Systems,  Inc. (the "Company") is registering for resale
2,457,974  shares of common stock,  $.01 par value (the "Common  Stock"),  which
include (i)  2,368,422  shares  which have been and may be issued in  connection
with the  conversion  of $1,500,000  in principal  amount of the Company's  7.5%
Convertible Debentures due February 28, 1999 (the "Debentures"); and (ii) 89,552
shares  which may be issued upon the  exercise of warrants  granted to Grayson &
Associates,  Inc.  (the  "Grayson  Warrants").  All of the Common Stock  offered
hereby is being offered for the account of certain  shareholders  of the Company
which acquired their securities as a result of a private placement  conducted by
the  Company.  See  "Selling  Shareholders."  Additional  shares that may become
issuable as a result of the Grayson Warrants are offered hereby pursuant to Rule
416 under the Securities  Act of 1933, as amended (the  "Securities  Act").  The
Company will not receive any of the  proceeds  from the sale of the Common Stock
being  offered  hereby (the  "Offering"),  but will receive the  exercise  price
payable  upon the  exercise of the Grayson  Warrants.  There can be no assurance
that all or any part of the Grayson Warrants will be exercised or that they will
be exercised for cash.


     THE SECURITIES  OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK AND SHOULD NOT
BE PURCHASED BY INVESTORS WHO CANNOT AFFORD THE LOSS OF THEIR ENTIRE INVESTMENT.
PROSPECTIVE  PURCHASERS  SHOULD CAREFULLY  CONSIDER THE MATTERS  DISCUSSED UNDER
"RISK FACTORS" BEGINNING ON PAGE 4.

                             ---------------------

     THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED BY THE SECURITIES
AND  EXCHANGE  COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS  THE
SECURITIES AND EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION  PASSED
UPON THE  ACCURACY OR ADEQUACY OF THIS  PROSPECTUS.  ANY  REPRESENTATION  TO THE
CONTRARY IS A CRIMINAL OFFENSE.


                                                      Proceeds to Selling
                             Price to Public(1)       Shareholders(1) (2)
                             ------------------       -------------------

Per share of Common Stock    $1.00                     $1.00

Total (3)                    $2,457,974                $2,457,974

(1)  Estimated  based upon the average of the high and low sales  prices for the
Common Stock on July 10, 1997 as reported by Nasdaq.

(2)  Excludes  regular  brokerage  commissions  and  other  expenses,  including
expenses of counsel, if any, for the Selling Shareholders, which will be paid by
the Selling Shareholders. The other expenses of the offering are estimated to be
approximately $41,000, all of which will be paid by the Company.

(3)  Assumes  all  shares   registered   will  be  issued  to  the  Selling
Shareholders and will be sold in this offering.

                      -------------------------------------
                 The date of this Prospectus is August __, 1997

<PAGE>
                              AVAILABLE INFORMATION

     The Company is subject to the informational  requirements of the Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in  accordance
therewith,  files reports and other information with the Securities and Exchange
Commission  (the  "Commission").  Such  reports  and  other  information  can be
inspected  and  copied at the  public  reference  facilities  maintained  by the
Commission at Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549; and the
Commission's regional offices at Room 1204, 219 South Dearborn Street,  Chicago,
Illinois 60604;  Room 1028, 7 World Trade Center,  New York, New York 10007; and
Suite 500 East, 5757 Wilshire Boulevard,  Los Angeles,  California 90036. Copies
of such  material  can be  obtained  from the  Public  Reference  Section of the
Commission, 450 Fifth Street, N.W., Washington,  D.C. 20549 at prescribed rates.
The  Commission  maintains an internet  web site that  contains  reports,  proxy
statements and other materials filed  electronically  by the Company through the
Commission's Electronic Data, Gathering,  Analysis and Retrieval (EDGAR) system.
This web site can be accessed at http://www.sec.gov.  The Common Stock is traded
on The Nasdaq Small Cap Market ("Nasdaq") under the symbol "SALV," and copies of
reports and other  information  are also  available for inspection at The Nasdaq
Stock Market, 1735 K Street, N.W., Washington, D.C. 20006.

     The Company has filed with the Commission a Registration  Statement on Form
S-3 (the "Registration  Statement") under the Securities Act with respect to the
shares of Common Stock offered  hereby.  This Prospectus does not contain all of
the information set forth in the Registration Statement or the exhibits thereto.
As permitted by the rules and  regulations of the  Commission,  this  Prospectus
omits  certain  information  contained  or  incorporated  by  reference  in  the
Registration Statement. For further information, reference is hereby made to the
Registration Statement and exhibits thereto, copies of which may be inspected at
the offices of the Commission at 450 Fifth Street, N.W., Washington,  D.C. 20549
or obtained from the Commission at the same address at prescribed rates.

     The Company furnishes Annual Reports to the holders of its securities which
contain  financial  information which have been examined and reported upon, with
an opinion expressed by, its independent certified public accountants.

                                       2
<PAGE>

                      INFORMATION INCORPORATED BY REFERENCE

     The following  documents filed by the Company with the Commission  pursuant
to the Exchange Act are incorporated herein by reference:

          (1)  Annual  Report on Form 10-KSB for the fiscal year ended  December
               31, 1996, filed on March 31, 1997 (File No.  000-21284)  pursuant
               to  Section  13(a)  of the  Exchange  Act,  as  amended  on  Form
               10-KSB/A,  filed on June 10, 1997 (File No. 000-21284) (the "1996
               Annual Report");

          (2)  Quarterly  Report on Form  10-QSB  for the fiscal  quarter  ended
               March  31,  1997,  filed on May 15,  1997  (File  No.  000-21284)
               pursuant to Section 13(a) of the Exchange Act;

          (3)  Definitive  Proxy  Statement on Schedule 14A,  filed on April 29,
               1997  (File  No.  000-21284)  pursuant  to  Section  14(a) of the
               Exchange Act;

          (4)  Current  Report on Form 8-K dated May 30, 1997,  filed on May 30,
               1997  (File  No.  000-21284)  pursuant  to  Section  13(a) of the
               Exchange Act, as amended on Form 8-K/A dated May 30, 1997,  filed
               on June 9, 1997 (File No. 000-21284); and

          (5)  Current Report on Form 8-K dated July 5, 1997,  filed on July 30,
               1997  (File  No.  000-21284)  pursuant  to  Section  13(a) of the
               Exchange Act.

     All documents filed by the Company with the Commission pursuant to Sections
13(a),  13(c),  14 or 15(d) of the  Exchange Act  subsequent  to the date hereof
shall hereby be deemed to be incorporated by reference in this Prospectus and to
be a part  hereof  from the date of filing  of such  documents.  See  "Available
Information." Any statement contained in a document incorporated or deemed to be
incorporated  herein by reference  shall be deemed to be modified or  superseded
for purposes of this Prospectus to the extent that a statement  contained herein
or in any  other  subsequently  filed  document  incorporated  or  deemed  to be
incorporated  herein by reference  modifies or supersedes  such  statement.  Any
statement  contained  herein  shall be deemed to be modified or  superseded  for
purposes of this  Prospectus  to the extent that a  statement  contained  in any
subsequently filed document  incorporated or deemed to be incorporated herein by
reference modifies or supersedes such statement.  Any such statement so modified
or  superseded  shall not be deemed,  except as so  modified or  superseded,  to
constitute a part of this Prospectus.

     THIS PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE WHICH ARE NOT PRESENTED
HEREIN OR DELIVERED  HEREWITH.  COPIES OF THESE  DOCUMENTS  (EXCLUDING  EXHIBITS
UNLESS  SUCH  EXHIBITS  ARE  SPECIFICALLY  INCORPORATED  BY  REFERENCE  INTO THE
INFORMATION  INCORPORATED  HEREIN)  WILL BE PROVIDED BY FIRST CLASS MAIL WITHOUT
CHARGE TO EACH PERSON TO WHOM THIS PROSPECTUS IS DELIVERED, UPON WRITTEN OR ORAL
REQUEST BY SUCH PERSON TO  SHAREHOLDER  RELATIONS,  SALIVA  DIAGNOSTIC  SYSTEMS,

                                       3
<PAGE>

INC., 11719 NE 95TH STREET, VANCOUVER,  WASHINGTON 98682 (TELEPHONE NUMBER (360)
696-4800).

     No person has been  authorized in connection with this offering to give any
information  or to make any  representation  not  contained or  incorporated  by
reference  in this  Prospectus  and,  if  given  or made,  such  information  or
representation must not be relied upon as having been authorized by the Company,
the  Selling  Shareholders  or  any  other  person.  This  Prospectus  does  not
constitute  an offer to sell,  or a  solicitation  of an offer to purchase,  any
securities other than those to which it relates, nor does it constitute an offer
to  sell  or a  solicitation  of an  offer  to  purchase  by any  person  in any
jurisdiction  in which it is  unlawful  for such person to make such an offer or
solicitation.  Neither  the  delivery  of  this  Prospectus  nor any  sale  made
hereunder  shall  under  any  circumstances  create  any  implication  that  the
information  contained  herein is correct as of any time  subsequent to the date
hereof.


                              CAUTIONARY STATEMENT

     This prospectus,  as well as information  incorporated by reference herein,
contains  forward-looking   statements,   within  the  meaning  of  the  Private
Securities  Litigation Reform Act of 1995.  Forward-looking  statements include,
but  are not  limited  to,  those  statements  relating  to  development  of new
products,  the  ability  to obtain  new  distribution  agreements  and  increase
distribution for products under existing  distribution  agreements,  approval of
the Company's products as and when required by the Food and Drug  Administration
("FDA") in the United States and similar  regulatory  bodies in other countries,
and the  scale-up  of  manufacturing  in the  United  States and  attendant  FDA
approvals.  These  forward-looking  statements  are subject to the  business and
economic  risks faced by the  Company and the  Company's  actual  results  could
differ materially from those anticipated in these forward-looking  statements as
a result of certain  factors,  including  those set forth under  "Risk  Factors"
below,  under  "Item 1 - Business"  and "Item 6 -  Management's  Discussion  and
Analysis  or Plan of  Operation"  in the 1996  Annual  Report,  and in the other
documents incorporated by reference herein.


                                  RISK FACTORS

     The securities  offered hereby are speculative and involve a high degree of
risk,  including,  but not limited to, the risk factors  described  below.  Each
prospective  investor  should  carefully  consider  the  following  risk factors
inherent in and affecting  the business of the Company and this offering  before
making an investment decision.

     1. Limited Operating History. Since July 1990, the Company has been engaged
primarily  in  research  and  development   activities   focused  on  developing
proprietary collection devices and rapid assays. To date, sales of the Company's
products  have  been to a  limited  customer  base.  The  Company  has a limited
operating  history upon which an evaluation  of the  Company's  prospects can be
made.  Such  prospects  must be considered  in light of the risks,

                                       4
<PAGE>

expenses and  difficulties  frequently  encountered in  the  establishment of a
new  business  in  a   continually   evolving,   heavily   regulated   industry,
characterized   by  an  increasing   number  of  market   entrants  and  intense
competition,  as well as the risks, expenses and difficulties encountered in the
shift from development to  commercialization of new products based on innovative
technology. There can be no assurance that the Company will be able to implement
successfully  its marketing  strategy,  obtain  necessary  regulatory  approval,
generate increased revenues or ever achieve profitable operations.

     2. Significant Operating Losses; Accumulated Deficit; Explanatory Paragraph
in Report of Independent Certified Public Accountants.  The Company has incurred
significant  operating  losses since its inception,  resulting in an accumulated
deficit of $21,914,246  and $23,089,147 at December 31, 1996 and March 31, 1997,
respectively,  and a shareholders' equity of $1,160,632 and $350,265 at December
31, 1996 and March 31, 1997,  respectively.  The Company has incurred additional
operating losses through the date of this  Prospectus.  Such losses are expected
to continue  for the  foreseeable  future and until such time,  if ever,  as the
Company is able to attain sales levels sufficient to support its operations. The
Company's  independent certified public accountants have included an explanatory
paragraph  in their  report  stating that the  Company's  significant  operating
losses and significant  capital  requirements  raise substantial doubt about the
Company's ability to continue as a going concern.

     3. Significant Capital  Requirements;  Need for Additional  Financing.  The
Company's  capital  requirements  have been and will continue to be significant.
The  Company has been  dependent  on private  placements  of its debt and equity
securities  and on a public  offering of  securities  in March 1993 to fund such
requirements.  The Company is dependent  upon its other efforts to raise capital
resources, including proceeds received from the exercise of warrants, to finance
the  costs of  manufacturing,  marketing  and  conducting  clinical  trials  and
submissions  for FDA  approval of its  products  and  continuing  the design and
development of the Company's new products. Marketing, manufacturing and clinical
testing may require capital resources  substantially  greater than the resources
currently  available to the Company.  There can be no assurance that the Company
will be able to obtain  additional  capital  resources  necessary  to permit the
Company to implement or continue its  programs.  There can be no assurance  that
such financing will be available on commercially reasonable terms or at all. Any
additional equity financing may involve substantial dilution to the interests of
the Company's shareholders, which dilution also has occurred in the past.

     4. Uncertain Acceptance of Saliva-Based Tests and Rapid Tests as Diagnostic
Tools.  The human specimens  traditionally  used for the diagnostic  testing and
quantitative  measurement of most physiologically  active substances,  drugs and
toxins in the body, are blood and urine.  Substantially  all of the  assay-based
diagnostic  test kits currently  available were approved by the FDA for use with
these testing specimens.  Political and social factors may create impediments to
the use of rapid  tests as  diagnostic  tools.  These  factors  include  whether
certain  diagnostic  tests,  such as HIV  antibody  tests,  should be  conducted
without trained  specialists and whether rapid tests in  nontraditional  testing
environments   will  lead  to  invasions   of  privacy.   Although  the  Company
acknowledges the existence of such considerations, it is committed to developing
rapid testing devices as useful diagnostic  tools.  Limitations on the Company's
ability to market rapid

                                       5
<PAGE>

tests caused by  political  and social  factors could  have a material  adverse
effect on the Company's operations.

     5.  Uncertainty of New Product  Development.  The design and development of
the  Company's  rapid  testing  platforms  in their  current  designs  have been
completed  and limited  revenues have been  generated  from sales  thereof.  The
Company will be required to devote  considerable  additional efforts to finalize
the evaluation of its products. Satisfactory completion of development, testing,
evaluations,  obtaining regulatory approvals and achieving sufficient production
levels of such  products  will be required  prior to their being  available  for
commercial sale. The Company's products remain subject to all the risks inherent
in  the  introduction  of  new  diagnostic  products,   including  unanticipated
problems, as well as the possible  insufficiency of funds to continue design and
development  which could result in abandonment  of or substantial  change in the
design or  development  of such  products.  There can be no assurance  that such
products will be successfully developed, be developed on a timely basis or prove
to  be  as  effective  as  products   based  on  existing  or  newly   developed
technologies.   The  inability  to  successfully  complete  development,   or  a
determination by the Company,  for financial or other reasons,  not to undertake
to complete  development of any product,  particularly in instances in which the
Company has made significant capital expenditures, could have a material adverse
effect on the Company.

     6.  Competition.  The  market in which the  Company  operates,  saliva  and
blood-based  collection  and  diagnostic  testing,  is highly  competitive.  The
Company is aware of certain entities,  including ChemTrak,  Inc., Epitope, Inc.,
Quidel, Inc. and Trinity Biotech,  plc and specialized  biotechnology  firms, as
well as universities  and other research  institutions,  which have developed or
are developing  technologies and products which are competitive with Omni-SAL(R)
and the Company's  products under  development.  Many of these  competitors  are
established and have  substantially  greater  research,  marketing and financial
resources  than the  Company.  The Company  expects  that the number of products
competing  with  its  products  will  increase  as  the  perceived  benefits  of
saliva-based  testing become more widely  recognized.  There can be no assurance
the Company will be able to compete successfully.

     7.  Technological  Change  and  Risk  of  Technological  Obsolescence.  The
biotechnology  industry and, in particular,  saliva and  blood-based  diagnostic
testing, is subject to rapid and significant  technological change. There can be
no  assurance  that the  Company's  competitors  will not succeed in  developing
technologies  and products  relating to the  collection of saliva for diagnostic
testing  prior to the  Company or that they will not  develop  technologies  and
products that are more effective than any which have been or are being developed
by the Company. In addition,  the diagnostic products market is characterized by
changing  technology and developing  industry standards  sometimes  resulting in
product obsolescence or short product life cycles.  Accordingly,  the ability of
the Company to compete  will be  dependent  on its  introducing  products to the
marketplace in a timely manner and enhancing and improving such products.  There
can  be  no  assurance  that  the  Company  will  be  able  to  keep  pace  with
technological developments or that its products will not become obsolete.

                                       6
<PAGE>

     8.  Government  Regulation.  The  development,  manufacture and sale of the
Company's products in the United States are subject to regulation by the FDA and
other governmental agencies. The process of obtaining FDA approval is costly and
time-consuming, and there can be no assurance that any of the Company's products
not yet  approved  will be  approved  by the FDA or other  regulatory  agencies.
Delays in obtaining  regulatory  approvals may adversely affect the development,
testing or marketing of the Company's products and the ability of the Company to
generate  product  revenues  therefrom.  If and when the Company's  products are
approved by the FDA,  they will be subject to  continuing  regulation by the FDA
and state and local  agencies.  The FDA has established a number of requirements
for manufacturers and requirements regarding labeling and reporting. The failure
to comply with these  requirements  can result in regulatory  action,  including
warning letters, product seizure,  injunction,  product recalls, civil fines and
prosecution.  An FDA enforcement  action could have a material adverse effect on
the Company.  The Company is subject to regulation in certain  foreign  markets.
There can be no assurance  that  regulatory  approvals  for any of the Company's
products  or for its  manufacturing  in the United  States will be obtained in a
timely manner, or at all.

     9. Risks Related to Foreign  Activities.  The Company and its manufacturers
may  be  subject  to  various  import  duties  imposed  by  foreign  governments
applicable  to both  finished  products  and  components  and may be affected by
various  other  import  and  export  restrictions  or  duties  as well as  other
developments  having an impact upon  international  trade.  These factors could,
under certain  circumstances,  have an impact both on the manufacturing cost and
the  wholesale  and  retail  prices  of  such  products.   To  the  extent  that
transactions relating to foreign sales,  manufacturing of the Company's products
and purchases of components involve currencies other than United States dollars,
the operating results of the Company could be adversely affected by fluctuations
in foreign currency exchange rates.

     10.  Uncertainty  of  Market   Acceptance;   Dependence  Upon  Third  Party
Distributors.  The Company has limited  marketing  capabilities  and  resources.
Achieving market acceptance will require  substantial  marketing efforts and the
expenditure of significant funds to inform potential consumers and the public of
the perceived benefits of the Company's current and proposed products. Moreover,
the  Company  does not have  the  financial  or  other  resources  to  undertake
extensive marketing and advertising  activities.  The Company has recently begun
to develop  strategic  alliances and  marketing  arrangements,  including  joint
ventures, license or distribution arrangements.  The Company's prospects will be
significantly  affected by its ability to successfully  develop and maintain its
relationships with its joint venturers,  licensors and distributors and upon the
marketing  efforts of such third  parties.  While the Company  believes that any
independent distributors and sales representatives with whom it enters into such
arrangements  will have an economic  motivation to  commercialize  the Company's
products,  the time and resources devoted to those activities  generally will be
controlled  by such  entities and not by the Company.  There can be no assurance
that the Company will be able,  for financial or other  reasons,  to develop and
maintain any third party  distribution  or marketing  arrangements  or that such
arrangements, if established, will result in the successful commercialization of
any of the Company's products.

                                       7
<PAGE>

     11.  Dependence on  Manufacturers.  The Company relies on arrangements with
third parties for the manufacture of some of its products.  Such  manufacturers,
if located in the United States or if  manufacturing  products to be sold in the
United States, must comply with ( the FDA's good manufacturing practices ("GMP")
and pass pre-approval  inspections by the FDA and periodic GMP inspections.  MML
Diagnostic Packaging, Inc. ("MML") manufactures Omni-Swab and Saliva*Sampler for
the  Company in the United  States and has  advised  the  Company  that it is in
compliance with all applicable FDA  requirements for such  manufacturing.  There
can be no assurance that the Company's manufacturer will continue to comply with
GMP,  that the  Company  will be able to locate  additional  manufacturers  that
comply with GMP or secure agreements with such manufacturers on terms acceptable
to the  Company.  There  can be no  assurance  that MML will be able to meet the
Company's  requirements  or that MML will continue to  manufacture  Omni-Swab or
Saliva*Sampler on terms acceptable to the Company.

     12. Dependence Upon Third-Party  Suppliers.  The Company believes that most
of the components used in the manufacture of its proposed products are currently
available from numerous suppliers located in the United States, Europe and Asia.
The Company  believes,  however,  that certain  components  are available from a
limited  number of  suppliers.  Although the Company  believes  that it will not
encounter difficulties in obtaining these components,  there can be no assurance
that  the  Company  will  be able  to  enter  into  satisfactory  agreements  or
arrangements for the purchase of commercial  quantities of such components.  The
failure to enter into  agreements  or  otherwise  arrange for adequate or timely
supplies of components and the possible inability to secure alternative  sources
of components could have a material  adverse effect on the Company's  ability to
manufacture its products.  In addition,  development and regulatory  approval of
the Company's  products in the United  States are  dependent  upon the Company's
ability to procure  certain  components  and certain  packaging  materials  from
FDA-approved sources.  Since the FDA approval process requires  manufacturers to
specify  their  proposed  suppliers  of certain  components  in their  premarket
approval  applications  ("PMAs"), if any such component were no longer available
from the specified  supplier,  FDA approval of a new supplier would be required,
resulting in potential manufacturing delays.

     13.  Dependence on Small Number of Customers.  The Company  derives a large
portion of its  revenues  from sales to a small  number of  customers.  Sales to
three customers  accounted for  approximately  49% of total product  revenues in
1996. Sales to two customers  accounted for  approximately  50% of total product
revenues  in 1995.  The loss of sales to any of the  Company's  major  customers
could have a material  adverse effect on the Company's  financial  condition and
results of operations.

     14. Dependence on Key Personnel. The success of the Company will be largely
dependent on the personal  efforts of Kenneth J.  McLachlan,  its  President and
Chief Executive  Officer,  and certain key management and scientific  personnel.
The loss of Mr. McLachlan's  services or the services of other key management or
scientific  personnel  would have a  material  adverse  effect on the  Company's
business and prospects.  Competition among biotechnology companies for qualified
employees is intense,  and the loss of key personnel or the inability to attract
and retain the additional  highly skilled  employees  required for the Company's
activities

                                       8
<PAGE>

could adversely affect its business.  There can be no assurance that the Company
will be able to hire or retain such necessary personnel.

     15. Uncertainty of Patent Protection;  Proprietary Information. The Company
has  applied  for  United  States  patents  on  certain  aspects  of its  saliva
collection  and  diagnostic  testing  devices and has been awarded four of these
patents.  To the extent  possible,  the Company also  anticipates  filing patent
applications for protection on future products and technology which it develops.
There can be no assurance  that patents  applied for will be obtained,  that any
such patents will afford the Company commercially  significant protection of its
technology  or that the  Company  will have  adequate  resources  to enforce its
patents.  Inasmuch  as the  Company  intends  to sell its  products  in  foreign
markets,  it is in the  process  of seeking  foreign  patent  protection  on its
current products and technologies. The patent laws of other countries may differ
from  those  of the  United  States  as to the  patentability  of the  Company's
products and technologies and the degree of protection afforded. Other companies
may independently  develop  equivalent or superior products and technologies and
may obtain patent or similar rights with respect  thereto.  Although the Company
believes that its products and technologies  have been  independently  developed
and do not infringe on the patents of others, there can be no assurance that the
Company's  products and technologies do not and will not infringe on the patents
of others.  In the event of  infringement,  the  Company  would,  under  certain
circumstances,  be required to modify its device or obtain a license.  There can
be no assurance that the Company will be able to do either of the foregoing in a
timely manner or upon acceptable terms and conditions,  and the failure to do so
could have a material  adverse effect on the Company.  There can be no assurance
that the  Company  will  have the  financial  or other  resources  necessary  to
successfully defend a claim of violation of proprietary rights.

     16. Product Liability;  Insurance  Coverage.  The Company may be exposed to
potential product  liability claims by consumers.  The Company maintains product
liability insurance coverage in an amount up to $1,000,000 per occurrence, up to
a maximum  of  $2,000,000  in the  aggregate,  with  excess  umbrella  liability
insurance  coverage of $4,000,000.  In the event of a product  liability  claim,
there can be no assurance  that such  insurance  will be sufficient to cover all
possible  liabilities.  In the event of a  successful  suit against the Company,
insufficiency of insurance  coverage would have a material adverse effect on the
Company.

     17. Possible Removal of Securities from Nasdaq System;  Disclosure Relating
to Low-Priced  Stocks.  If the Company should continue to experience losses from
operations,  it may be unable to maintain the standards for continued  quotation
on Nasdaq and the  Common  Stock  could be  subject  to removal  from the Nasdaq
system.  Upon the filing by the Company of its Form 10-QSB for the period  ended
March 31,  1997,  Nasdaq  issued a letter to the  Company  asking the Company to
demonstrate  that it currently  meets all Nasdaq  listing  requirements  and can
continue  to meet those  requirements.  In order to  continue  to be included in
Nasdaq,  a company must maintain  $2,000,000 in total assets,  a $200,000 market
value of the public  float and  $1,000,000  in total  capital  and  surplus.  In
addition, continued inclusion requires two market-makers and a minimum bid price
of $1.00 per  share;  provided,  however,  that if a company  falls  below  such
minimum bid price, it will remain eligible for continued  inclusion in Nasdaq if
the market value of the public float is at least  $1,000,000 and the Company has

                                       9
<PAGE>

$2,000,000 in capital and surplus.  The Company's  total capital and surplus was
$1,160,632 at December 31, 1996 and $350,265 at March 31, 1997. On June 5, 1997,
the Company  caused the early  conversion  of  $800,000 of the 7.5%  Convertible
Debentures  due  February  28,  1999  (the  "Debentures")  to  Common  Stock  to
demonstrate current compliance with the Nasdaq continued inclusion  requirements
and submitted to Nasdaq on June 4, 1997, its plan to sustain compliance with the
Nasdaq continued  inclusion  requirements  with Nasdaq  requirements.  By letter
dated  July 16,  1997,  Nasdaq  advised  the  Company of its  acceptance  of the
Company's plan to  sustain  compliance  upon certain  conditions.  To date, the
Company has  performed in  accordance  with such  conditions.  If the Company is
removed  from the Nasdaq  system,  trading,  if any,  in the Common  Stock would
thereafter be conducted in the over-the-counter market on an electronic bulletin
board  established  for  securities  that  do  not  meet  the  Nasdaq  inclusion
requirements  or in what are  commonly  referred to as the "pink  sheets".  As a
result,  an investor  would find it more  difficult  to dispose of, or to obtain
accurate quotations as to the price of, the Company's  securities.  In addition,
if the Company's  securities were removed from the Nasdaq system,  they would be
subject to so-called  "penny stock" rules that impose  additional sales practice
requirements on broker-dealers who sell such securities.  Consequently,  removal
from the  Nasdaq  system,  if it were to occur,  could  affect  the  ability  or
willingness of broker-dealers  to sell the Company's  securities and the ability
of  purchasers  of the  Company's  securities  to sell their  securities  in the
secondary market. There is no assurance that the Company will continue to remain
eligible for continued inclusion of the Common Stock on Nasdaq.

     18. No  Dividends.  To date,  the Company has not paid any dividends on its
Common  Stock  and  does not  expect  to  declare  or pay any  dividends  in the
foreseeable future.

     19.  Significant  Outstanding  Options and  Warrants.  As of July 30, 1997,
there were  outstanding  (i) stock options to purchase an aggregate of 1,569,749
shares of Common Stock at exercise prices ranging from $0.43 to $5.50 per share;
(ii) warrants to purchase  1,380,000 shares of Common Stock which were issued in
the Company's  initial public offering,  are exercisable at $3.00 per share, and
expire December 31, 1997 unless  extended by the Company;  and (iii) warrants to
purchase  533,104  shares which are  exercisable at prices ranging from $1.00 to
$4.00 per share.

     To the extent that outstanding options or warrants are exercised,  dilution
to the Company's  shareholders  will occur.  Moreover,  the terms upon which the
Company  will be able to  obtain  additional  equity  capital  may be  adversely
affected since the holders of  outstanding  options and warrants can be expected
to exercise them at a time when the Company would, in all likelihood, be able to
obtain  any  needed  capital on terms more  favorable  to the  Company  than the
exercise terms provided by such outstanding securities.

     20. Litigation.  The Company is currently involved in litigation brought by
Luc Hardy against the Company and former  officer and  directors,  Ronald Lealos
and Eugene Seymour,  and Richard Kalin. This matter involves allegations against
the Company and the individual  defendants arising from Mr. Hardy's  termination
by the Company in 1994. A jury verdict for the  plaintiff,  which is not a final
judgment,  was rendered on July 25, 1997 in the approximate  amount of $740,000.
The Company  plans to file with the court  motions to set aside the jury

                                       10
<PAGE>

verdict and to move for a new trial.  There can be no  assurance  such  motions
will be granted or that the final judgment in this case will not have a material
adverse effect on the Company.

                                   THE COMPANY

     The Company is  primarily  engaged in the  development,  manufacturing  and
marketing  of rapid in  vitro  assays  for use in the  detection  of  infectious
diseases and other conditions, proprietary specimen collection devices and other
diagnostic  devices.  The Company's  principal  executive offices are located at
11719 NE 95th Street, Vancouver,  Washington,  98682 and its telephone number is
(360) 696-4800.

     The Company develops rapid immunoassays utilizing immunochromatography for
the detection of antibodies  to selected  pathogens,  such as the HIV, the virus
that causes AIDS, and  Helicobacter  pylori,  a bacteria linked to peptic ulcers
and gastric cancer.  The Company's  immunoassays  are designed to require only a
few simple steps and minutes to use. The tests produce  visual  results in under
20 minutes, and may be used without special equipment,  storage or training. The
Company's data and independent  evaluations  demonstrate that its Hema*Strip HIV
and Sero*Strip HIV tests are generally  equivalent in performance to widely used
FDA-licensed tests for HIV.

     To date, the Company has developed  three rapid HIV tests:  Sero*Strip HIV,
Hema*Strip HIV and  Saliva*Strip  HIV, and a rapid H. pylori test:  Stat*Simple.
The Company has under development several rapid tests for hepatitis. The Company
has commenced  production  and marketing of three medical  specimen  collectors:
Omni-SAL(R),   Saliva*Sampler  and  Omni-Swab.  In  addition,  the  Company  has
conducted  preliminary  research  that  indicates  its rapid test  format may be
expanded to detect  other  diseases,  such as  tuberculosis,  measles,  malaria,
rubella, tetanus, herpes, chlamydia,  mumps, influenza,  parvovirus,  pertussis,
certain cancers,  tumor markers and cardiac disease.  Additionally,  the Company
believes  that, in many cases,  its tests may be able to use saliva for analysis
as well as blood and serum, although research has not been completed on this.


                              SELLING SHAREHOLDERS

     The Selling  Shareholders  are (i) the Tail Wind Fund Limited ("Tail Wind")
and Joseph Kaufman, the purchasers of $1,100,000 and $400,000,  respectively, in
principal amount of the Company's 7.5%  Convertible  Debentures due February 28,
1999 (the "Debentures");  and (ii) Grayson & Associates,  Inc. ("Grayson"),  the
owner of  warrants  to  purchase  89,552  shares of Common  Stock (the  "Grayson
Warrants")  acquired in connection with the private placement of the Debentures.
The  foregoing  entities  and  individual  are  collectively  referred to as the
"Selling Shareholders."

                                       11
<PAGE>

     All of the shares of Common  Stock that have been or may be acquired by the
Selling  Shareholders  upon  conversion  of the  Debentures  or  exercise of the
Grayson Warrants are being registered pursuant to the Registration  Statement of
which this Prospectus forms a part, and are being offered hereby.

     The  Company  will not receive  any  proceeds  from the sale of the Selling
Shareholders'  Common Stock.  Sales of any shares of Common Stock by the Selling
Shareholders, or even the existence of the right to acquire additional shares of
Common  Stock by reason of the  Debetures,  or to acquire  Common Stock upon the
exercise of the Grayson Warrants, may depress the price of the Common Stock.

     On June 5, 1997, Tail Wind and Kaufman  converted an aggregate  $800,000 in
principal amount of Debentures for a total of 833,598 shares of Common Stock. On
June 30,  1997,  Tail  Wind and  Kaufman  converted  an  aggregate  $700,000  in
principal amount of Debentures for a total of 903,226 shares of Common Stock. As
of the date of this Prospectus,  TailWind has converted  $1,100,000 in principal
amount of the  Debentures  for a total of  1,276,739  shares of Common Stock and
Kaufman has converted $400,000 in principal amount of the Debentures for a total
of 460,085 shares of Common Stock.  On July 14, 1997, the Company issued to each
of Tail  Wind and  Kaufman  Kaufman  20,242  and 7,362  shares of Common  Stock,
respectively,  in payment of interest on the  Debentures.  Each of Tail Wind and
Kaufman may receive  additional  shares of Common Stock pursuant to the terms of
the  Debentures  if, (i) in the case of the  conversion  on June 5, 1997, at any
time  during  the  120-day  period  (and only one time for each of Tail Wind and
Kaufman)  following  effectiveness of the registration  statement  covering such
shares,  the  Conversion  Price at that time is less  than the early  Conversion
Price;  and (ii) in the case of the  conversion  on June 30,  1997,  during  any
monthly  period prior to January 1, 1998,  the average  daily bid price for each
day during such period is less than the early Conversion  Price. The "Conversion
Price" is the lesser of (i)  $1.9191,  and (ii) 80% of the Current  Market Price
(as defined below) on the applicable conversion date. The "Current Market Price"
per share of Common  Stock on any date is the  average of the closing bid prices
of the Common Stock for the five consecutive  trading days ending on the trading
day immediately  prior to the date in question,  as reported by the Nasdaq Small
Cap Market.

     Each of Tail Wind and Grayson  participated  in a private  placement by the
Company in June 1997,  pursuant to which Tail Wind  purchased  412,905 shares of
Common Stock for an aggregate  purchase price of $300,000 and Grayson  purchased
200,000 shares of Common Stock for an aggregate purchase price of $100,000. Each
of Tail Wind and Grayson will acquire certain warrants to purchase up to 100,000
and 226,632 shares of Common Stock,  respectively,  in connection  with the June
1997 private placement. Kaufman owns no shares of Common Stock other than as set
forth above.

     None of the Selling  Shareholders  nor any of their affiliates has held any
position or office within the Company or has had any other material relationship
with the  Company,  except  that  Grayson  received  a cash fee in the amount of
$120,000 and the Grayson  Warrants as compensation  for assisting the Company in
the  $1,500,000  Debenture  financing and a cash fee of $160,800 and warrants to
purchase up to 226,632  shares of Common Stock in connection  with

                                       12
<PAGE>

the June 1997 private  placement.  In  addition,  Grayson  has been  engaged by
the Company to provide certain capital raising services through September 1997.


                              PLAN OF DISTRIBUTION

     The Selling  Shareholders  may sell the shares in one or more  transactions
(which may  involve  one or more  block  transactions)  on the  over-the-counter
markets on the Nasdaq and upon terms then prevailing or at prices related to the
then current  market price,  or in separately  negotiated  transactions  or in a
combination of such transactions. The Common Stock offered hereby may be sold by
one or more of the following methods,  without limitation:  (a) a block trade in
which a broker or dealer so engaged will attempt to sell the shares as agent but
may position and resell a portion of the block as  principal to  facilitate  the
transaction; (b) purchases by a broker or dealer as principal and resale by such
broker or dealer for its  account  pursuant  to this  Prospectus;  (c)  ordinary
brokerage transactions and transactions in which the broker solicits purchasers;
and (d)  face-to-face  transactions  between  sellers and  purchasers  without a
broker-dealer.  The Selling Shareholders may be deemed to be underwriters of the
shares  offered  hereby  within the meaning of the  Securities  Act of 1933,  as
amended (the "Securities Act").

     In effecting sales,  brokers or dealers engaged by the Selling Shareholders
may arrange for other brokers or dealers to participate.  Such broker or dealers
may receive commissions or discounts from the Selling Shareholders in amounts to
be negotiated. All other expenses incurred in connection with this offering will
be borne by the Company other than the Selling  Shareholders' legal fees, except
that the Company has agreed to pay the first  $10,000 of Tail Wind's legal fees.
Such brokers and dealers and any other participating  brokers or dealers may, in
connection with such sales,  be deemed to be underwriters  within the meaning of
the Securities Act. Any discounts or commissions received by any such brokers or
dealers may be deemed to be  underwriting  discounts and  commissions  under the
Securities Act.

     The Company has agreed to indemnify  Tail Wind,  Kaufman and  Grayson,  and
Tail Wind,  Kaufman and Grayson  have agreed to  indemnify  the Company  against
certain civil  liabilities,  including certain  liabilities under the Securities
Act.


                                  LEGAL MATTERS

     The validity of the  securities  being  offered will be passed upon for the
Company by Bryan Cave LLP, 700 Thirteenth Street, Washington, D.C. 20005.


                                     EXPERTS

     The financial statements of the Company for the fiscal years ended December
31, 1996 and 1995 have been  audited by  Hollander,  Gilbert & Co.,  independent
certified  public  accountants,  to the extent and for the  periods set forth in
their report with respect thereto,  and are

                                       13
<PAGE>

included  the Company's Annual Report on  Form 10-KSB  for the fiscal year ended
December 31, 1996, and are incorporated herein by  reference,  in reliance  upon
such  report given  upon the  authority of  said firm as experts in auditing and
accounting.

                                       14
<PAGE>

     No dealer,  sales representative or other individual has been authorized to
give any information or make any representation not contained in this Prospectus
in connection  with this offering other than those  contained in this Prospectus
and if given or made, such information or representation must not be relied upon
as having been authorized by the Company. This Prospectus does not constitute an
offer to sell or  solicitation  of an offer to buy the Common Stock by anyone in
any  jurisdiction  in which such offer or  solicitation  is not authorized or in
which the person making such offer or  solicitation is not qualified to do so or
to any person to whom it is unlawful to make such offer or solicitation. Neither
the  delivery of this  Prospectus  nor any sale made  hereunder  shall under any
circumstances  create an implication  that the information  contained  herein is
correct as of any time subsequent to its date.



                                TABLE OF CONTENTS

                                                                            Page
Available Information..........................................................2
Information Incorporated By Reference..........................................3
Cautionary Statement...........................................................4
Risk Factors...................................................................4
The Company...................................................................11
Selling Shareholders..........................................................11
Plan of Distribution..........................................................13
Legal Matters.................................................................13
Experts.......................................................................13


     Until  September __, 1997 (40 days after the date of the  Prospectus),  all
dealers  effecting  transactions  in the registered  securities,  whether or not
participating  in this  distribution,  may be required to deliver a  Prospectus.
This delivery requirement is in addition to the obligation of dealers to deliver
a  Prospectus  when  acting as  Underwriter  and with  respect  to their  unsold
allotments or subscriptions.


                         SALIVA DIAGNOSTIC SYSTEMS, INC.

                        2,457,974 shares of Common Stock

                                   Prospectus

                                 August __, 1997


<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS


Item 14.  Other Expenses of Issuance and Distribution.

     The  expenses in  connection  with the  issuance  and  distribution  of the
securities  being  registered  hereby  will  be  borne  by the  Company  and are
estimated to be as follows:

Registration Fee.....................................................$   733.13
Legal Fees........................................................... 30,000.00*
Accounting Fees......................................................  5,000.00*
Miscellaneous........................................................  5,000.00*
                                                                     -----------
     Total........................................................... 40,733.13*
                                                                     ===========
- --------------------
* Estimated

Item 15.  Indemnification of Directors and Officers.

     Section 145 of the Delaware General  Corporation Law empowers a corporation
to indemnify its directors and officers and to purchase  insurance  with respect
to liability  arising out of their  capacity or status as directors and officers
provided  that this  provision  shall not  eliminate or limit the liability of a
director (i) for any breach of the director's duty of loyalty to the Corporation
or its  stockholders,  (ii) for  acts or  omissions  not in good  faith or which
involve  intentional  misconduct  or a knowing  violation of law,  (iii) arising
under Section 174 of the General  Corporation  Law of Delaware,  or (iv) for any
transaction from which the director derived an improper personal benefit.

     The  Delaware  Corporation  Law provides  further that the  indemnification
permitted  thereunder shall not be deemed exclusive of any other rights to which
the directors and officers may be entitled under the corporation's  by-laws, any
agreement, vote of shareholders or otherwise.

     Article Ten of the Company's  Certificate of  Incorporation  eliminates the
personal  liability of directors to the fullest extent  permitted by Section 145
of the Delaware Corporation Law.

     The effect of the  foregoing  is to require  the Company to  indemnify  the
officers and directors of the Company for any claim arising against such persons
in their official  capacities if such person acted in good faith and in a manner
that he reasonably believed to be in or not opposed to the best interests of the
corporation,  and,  with respect to any criminal  action or  proceeding,  had no
reasonable cause to believe his conduct was unlawful.

                                      II-1
<PAGE>

     INSOFAR AS INDEMNIFICATION FOR LIABILITIES ARISING UNDER THE SECURITIES ACT
OF 1933 MAY BE  PERMITTED  TO  DIRECTORS,  OFFICERS OR PERSONS  CONTROLLING  THE
COMPANY PURSUANT TO THE FOREGOING PROVISIONS, THE COMPANY HAS BEEN INFORMED THAT
IN THE OPINION OF THE SECURITIES AND EXCHANGE  COMMISSION,  SUCH INDEMNIFICATION
IS AGAINST PUBLIC POLICY AS EXPRESSED IN THE ACT AND IS THEREFORE UNENFORCEABLE.

Item 16.  Exhibits.

Exhibit No.  Description
- -----------  -----------
4.1          Specimen of Certificate  Representing Common Stock, incorporated by
             reference to  Exhibit 4.1 to   the Company's Registration Statement
             on Form S-1 (Registration No. 33-46648).

4.2          7.5%  Convertible  Debenture due February 28, 1999,  issued  by the
             Company to The Tail Wind Fund, Ltd. on March 11, 1997, incorporated
             by  reference  to Exhibit 4 to the  Company's  Quarterly  Report on
             Form 10-QSB for its fiscal quarter ended March 31, 1997.

4.3          Common Stock Purchase  Warrant for 89,552 shares,  issued by the
             Company to Grayson & Associates on March 14, 1997.*

4.4          Convertible  Securities  Subscription  Agreement,  dated  as  of
             March 11, 1997, between the Company and The Tail Wind Fund Ltd.*

4.5          Registration Rights Agreement, dated as of March 11, 1997, between
             the Company and The Tail Wind Fund Ltd.*

4.6          Letter  Agreement  dated  May 28,  1997  between  the  Company  and
             The  Tail  Wind  Fund  Ltd.,  incorporated  by reference to Exhibit
             4.9 to the Company's Current Report on Form 8-K dated June 5, 1997.

4.7          Letter  Agreement  dated  June 27,  1997  between  the  Company and
             The Tail  Wind  Fund  Ltd., incorporated  by  reference to Exhibit
             4.10 to the Company's Current Report on Form 8-K dated June 5, 1997

5            Opinion of Bryan Cave LLP*

23.1         Consent of Hollander, Gilbert & Company.**

23.2         Consent of Bryan Cave LLP (included in Exhibit 5).

- --------------------
*  Previously filed.
** To be filed by amendment.
                                      II-2
<PAGE>

Item 17.  Undertakings


     (a) Insofar as indemnification for liabilities arising under the Securities
Act of 1933, may be permitted to directors,  officers and controlling persons of
the Company pursuant to the foregoing  provisions or otherwise,  the Company has
been advised that,  in the opinion of the  Securities  and Exchange  Commission,
such  indemnification  is against  public policy as expressed in the Act and is,
therefore,  unenforceable. In the event that a claim for indemnification against
such liabilities  (other than the payment by the Company of expenses incurred or
paid  by a  director,  officer  or  controlling  person  of the  Company  in the
successful  defense of any  action,  suit or  proceeding)  is  asserted  by such
director,  officer or controlling person in connection with the securities being
registered,  the Company  will,  unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction  the  question  of whether  such  indemnification  by it is against
public  policy  as  expressed  in the Act  and  will be  governed  by the  final
adjudication of such issue.

     (b) The Company hereby undertakes:

     (1) To file,  during any period in which  offers or sales are being made, a
post-effective amendment to this Registration Statement to:

     (i) include any prospectus  required by Section 10 (a)(3) of the Securities
Act;

     (ii)  reflect  in the  prospectus  any  facts or events  arising  after the
effective date of this Registration Statement (or the most recent post-effective
amendment  thereof)  which,  individually  or  in  the  aggregate,  represent  a
fundamental change in the information set forth in this Registration Statement;

     (iii)  include  any  material  information  with  respect  to the  plan  of
distribution  not  previously  disclosed in this  Registration  Statement or any
material change to such information in this Registration Statement.

     (2) That, for the purpose of determining any liability under the Securities
Act, each such post-effective amendment shall be deemed to be a new Registration
Statement relating to the securities  offered therein,  and the offering of such
securities  at that time shall be deemed to be the  initial  bona fide  offering
thereof.

     (3) To remove from registration by means of a post-effective  amendment any
of the securities being registered which remain unsold at the termination of the
offering.

     (4) For purposes of determining any liability under the Securities Act, the
information  omitted from the form of Prospectus filed as part of a Registration
Statement in reliance  upon Rule 430A and  contained  in the form of  Prospectus
filed by Registrant  pursuant to Rule 424 (b)(1) or (4) under the Securities Act
shall be deemed to be part of the  Registration  Statement as of the time it was
declared effective.

                                      II-3
<PAGE>

     (5) For the purpose of determining  any liability under the Securities Act,
each post-effective amendment that contains a form of Prospectus shall be deemed
to be a new Registration  Statement  relating to the securities offered therein,
and the  offering  of such  securities  at that  time  shall be deemed to be the
initial bona fide offering thereof.

                                      II-4
<PAGE>

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended, the
registrant certifies that it has reasonable grounds to believe that it meets all
of  the   requirements  for  filing  on  Form  S-3  and  has  duly  caused  this
Post-Effective  Amendment  No. 2 to  Registration  Statement to be signed on its
behalf by the undersigned,  thereunto duly authorized, in the City of Vancouver,
State of Washington, on August 4, 1997.

                                    SALIVA DIAGNOSTIC SYSTEMS, INC.

                                    By: /s/ Kenneth J. McLachlan
                                        -------------------------------------
                                        Kenneth J. McLachlan
                                        President and Chief Executive Officer

     Pursuant to the  requirements  of the  Securities  Act of 1933, as amended,
this  Post-Effective  Amendment No. 2 to Registration  Statement has been signed
below by the following persons in the capacities and on the dates indicated.


       Signature                       Title                          Date
       ---------                       -----                          ----

/s/ Eric F. Stoer *       Director, President, Chief Executive    August 4, 1997
- ---------------------     Officer, Chief Financial Officer and
Kenneth J. McLachlan      Chief Accounting Officer

/s/ Eric F. Stoer         Director                                August 4, 1997
- ---------------------
Eric F. Stoer

/s/ Eric F. Stoer *       Director                                August 4, 1997
- ---------------------
Hans R. Vauthier

/s/ Eric F. Stoer *       Chief Operating Officer and             August 4, 1997
- ---------------------     Vice President of Marketing
Paul D. Slowey          

/s/ Eric F. Stoer *       Vice President of Operations            August 4, 1997
- ---------------------
Michael Grant


- -------------------
* Attorney-in-fact


<PAGE>

                         SALIVA DIAGNOSTIC SYSTEMS, INC.
                                  EXHIBIT INDEX

Exhibit No.      Description
- -----------      -----------  

4.1              Specimen of Certificate Representing Common Stock, incorporated
                 by  reference  to Exhibit 4.1  to the  Company's  Registration
                 Statement on Form S-1 (Registration No. 33-46648).

4.2              7.5%  Convertible  Debenture  due February  28,  1999,  issued 
                 by the Company to The Tail Wind Fund, Ltd.  on March 11,  1997,
                 incorporated  by  reference  to  Exhibit 4 to the  Company's
                 Quarterly Report on Form 10-QSB for its fiscal quarter ended
                 March 31, 1997.

4.3              Common  Stock  Purchase  Warrant  for  89,552  shares,  issued 
                 by the  Company  to  Grayson & Associates on March 14, 1997.*

4.4              Convertible Securities Subscription Agreement, dated  as  of
                 March  11, 1997, between  the Company  and The  Tail Wind Fund
                 Ltd.*

4.5              Registration  Rights Agreement,  dated as of March 11, 1997,
                 between the Company and The Tail Wind Fund Ltd.*

4.6              Letter  Agreement  dated May 28,  1997  between  the  Company 
                 and The Tail  Wind  Fund  Ltd.,  incorporated  by reference to
                 Exhibit 4.9 to the Company's Current  Report on Form 8-K dated
                 June 5, 1997.

4.7              Letter  Agreement  dated  June 27,  1997  between  the  Company
                 and The Tail Wind Fund  Ltd., incorporated  by reference to
                 Exhibit 4.10 to the Company's  Current  Report on Form 8-K
                 dated June 5, 1997.

5                Opinion of Bryan Cave LLP*

23.1             Consent of Hollander, Gilbert & Company.**

23.2             Consent of Bryan Cave LLP (included in Exhibit 5).

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*  Previously filed.
** To be filed by amendment.



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