ORAVAX INC /DE/
S-3, 1998-07-31
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1

      As filed with the Securities and Exchange Commission on July 31, 1998
                                                 Registration Statement No. 333-

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM S-3

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

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

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

                                  ORAVAX, INC.
             (Exact name of registrant as specified in its charter)

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

              DELAWARE                                 04-3085209
    (State or other jurisdiction          (I.R.S. Employer Identification No.)
 of incorporation or organization)


                                38 SIDNEY STREET
                         CAMBRIDGE, MASSACHUSETTS 02139
                        (Address, including zip code, and
                     telephone number, including area code,
                            of registrant's principal
                               executive offices)

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

                                 LANCE K. GORDON
                      PRESIDENT AND CHIEF EXECUTIVE OFFICER
                                  ORAVAX, INC.
                                38 SIDNEY STREET
                         CAMBRIDGE, MASSACHUSETTS 02139
                                 (617) 494-1339
                     (Name, address, including zip code, and
                     telephone number, including area code,
                              of agent for service)

                                    COPY TO:

                           JOHN M. WESTCOTT, JR., ESQ.
                                HALE AND DORR LLP
                                 60 STATE STREET
                           BOSTON, MASSACHUSETTS 02109
                                 (617) 526-6000

     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO PUBLIC: FROM TIME TO
TIME AFTER THIS REGISTRATION STATEMENT BECOMES EFFECTIVE.

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



<PAGE>   2


     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. [ ] 333-_______.

     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. [ ] 333-__________.


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


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

<TABLE>
<CAPTION>
                                          CALCULATION OF REGISTRATION FEE

=========================================================================================================================
                                                                       Proposed          Proposed
            Title of Each Class of                    Amount           Maximum           Maximum
          Securities to be Registered                  to be        Offering Price      Aggregate          Amount of
                                                   Registered(1)     Per Share(2)   Offering Price(2)   Registration Fee
- -------------------------------------------------------------------------------------------------------------------------
<S>                                               <C>                  <C>             <C>                    <C>
Common Stock, $.001 par value per share........   264,000 shares       $0.9844         $259,881.60            $77
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>


(1)  In addition, pursuant to Rule 416 under the Securities Act, this
     Registration Statement covers such indeterminate number of additional
     shares of Common Stock as may become issuable to the Selling Stockholders
     from time to time pursuant to application of the anti-dilution provisions
     of the Agreements between the Company and the Selling Stockholders to sales
     of additional shares of Common Stock by the Company.

(2)  Estimated solely for purposes of calculating the registration fee pursuant
     to Rule 457(c) under the Securities Act and based upon the average of the
     high and low prices on the Nasdaq National Market on July 24, 1998.


     THE COMPANY HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE COMPANY 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),
SHALL DETERMINE.

================================================================================



<PAGE>   3


PROSPECTUS


                   Subject to Completion, dated July 31, 1998

                                 264,000 Shares

                                  ORAVAX, INC.

                                  Common Stock

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

     This Prospectus covers the resale of up to 264,000 shares of Common Stock,
$0.001 par value per share (the "Common Stock") of OraVax, Inc. ("OraVax" or the
"Company") by certain stockholders of the Company (the "Selling Stockholders").
See "Selling Stockholders." 240,000 of the shares of Common Stock covered by
this Prospectus were issued to the Selling Stockholders pursuant to the several
Stock Purchase Agreements between the Company and the Selling Stockholders, each
dated as of December 23, 1997 (collectively, the "Purchase Agreements"). The
remaining 24,000 shares of Common Stock may be issuable to Selling Stockholders
who received certain warrants to acquire Common Stock in connection with the
services of Cappello Capital Corp. as placement agent. All of the shares offered
hereunder are to be sold by the Selling Stockholders. The Company will not
receive any of the proceeds from the sale of the shares by the Selling
Stockholders.

     The shares covered by this Prospectus represent the number of shares that
may be offered as of the date of this Prospectus based upon the present number
of shares held by the Selling Stockholders. The actual number of shares of
Common Stock offered hereby is subject to adjustment and could be materially
more than the amount indicated depending upon the application of the
anti-dilution provisions of the Purchase Agreements to sales of additional
shares of Common Stock by the Company.

     The Selling Stockholders may from time to time sell the shares covered by
this Prospectus on the Nasdaq National Market in ordinary brokerage
transactions, in negotiated transactions, or otherwise, at market prices
prevailing at the time of sale or at negotiated prices. See "Plan of
Distribution." The Common Stock is traded on the Nasdaq National Market under
the symbol "ORVX". 

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

                 THE SHARES OFFERED HEREBY INVOLVE A HIGH DEGREE
                OF RISK. SEE "RISK FACTORS" BEGINNING ON PAGE 5.

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

          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.

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


                The date of this Prospectus is __________, 1998.

<PAGE>   4


                              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, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information filed by the Company with the Commission
pursuant to the informational requirements of the Exchange Act may be inspected
and copied at the public reference facilities maintained by the Commission at
450 Fifth Street, N.W., Room 1024, Washington, D.C. 20549 and at the
Commission's regional offices located at Seven World Trade Center, Suite 1300,
New York, New York 10048, and at Citicorp Center, 500 West Madison Street, Suite
1400, Chicago, Illinois 60661. Copies of such materials also may be obtained
from the Public Reference Section of the Commission at 450 Fifth Street, N.W.,
Washington, D.C. 20549 at prescribed rates. In addition, the Company is required
to file electronic versions of these documents through the Commission's
Electronic Data Gathering, Analysis and Retrieval system (EDGAR). The Commission
maintains a World Wide Web site at http://www.sec.gov that contains reports,
proxy and information statements and other information regarding registrants
that file electronically with the Commission. The Common Stock of the Company is
traded on the Nasdaq National Market. Reports and other information concerning
the Company may be inspected at the National Association of Securities Dealers,
Inc., 1735 K Street, N.W., Washington, D.C. 20006.

     The Company has filed with the Commission a Registration Statement on Form
S-3 (together with all amendments, supplements, exhibits and schedules thereto,
the "Registration Statement") under the Securities Act of 1933, as amended (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, as certain items are omitted in accordance with the
rules and regulations of the Commission. For further information pertaining to
the Company and the shares of Common Stock offered hereby, reference is made to
the Registration Statement. Statements contained in this Prospectus regarding
the contents of any agreement or other document are not necessarily complete,
and in each instance reference is made to the copy of such agreement or document
filed as an exhibit to the Registration Statement, each such statement being
qualified in all respects by such reference. The Registration Statement,
including all exhibits and schedules thereto, may be inspected without charge at
the office of the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549,
and copies of all or any part thereof may be obtained from the Commission at
prescribed rates.


                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following documents filed by the Company with the Commission are
incorporated herein by reference: 

         (i)   The Company's Annual Report on Form 10-K for the year ended
               December 31, 1997, as filed with the Commission on March 31,
               1998;

         (ii)  The Company's Quarterly Report on Form 10-Q for the quarterly
               period ended March 31, 1998, as filed with the Commission on
               May 14, 1998; and




                                       -2-
<PAGE>   5


         (iii) The Company's Registration Statement on Form 8-A registering the
               Common Stock under Section 12(g) of the Exchange Act, as filed
               with the Commission on May 8, 1995.

     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 and
prior to the termination of the offering of the Common Stock registered hereby
shall be deemed to be incorporated by reference into this Prospectus and to be a
part hereof from the date of filing such documents. Any statement contained in a
document incorporated or deemed to be incorporated by reference herein 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 which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any statement so modified or superseded
shall not be deemed, except as so modified or superseded, to constitute a part
of this Prospectus.

     The Company will provide without charge to each person to whom this
Prospectus is delivered, upon written or oral request of such person, a copy of
any or all of the foregoing documents incorporated by reference into this
Prospectus (without exhibits to such documents other than exhibits specifically
incorporated by reference into such documents). All such requests shall be
directed to: OraVax, Inc., 38 Sidney Street, Cambridge, Massachusetts 02139,
Attention: Vice President, Finance, Telephone: (617) 494-1339.

     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS IN CONNECTION WITH THIS OFFERING OTHER THAN THOSE CONTAINED IN
THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH OTHER INFORMATION AND
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE
COMPANY. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER
SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO
CHANGE IN THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR THAT THE
INFORMATION CONTAINED HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN
OFFER TO BUY ANY SECURITIES OTHER THAN THE REGISTERED SECURITIES TO WHICH IT
RELATES. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION
OF AN OFFER TO BUY SUCH SECURITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR
SOLICITATION IS UNLAWFUL.

               SPECIAL NOTE REGARDING FORWARD-LOOKING INFORMATION

     Certain statements in this Prospectus and in the documents incorporated
herein constitute "forward-looking statements" within the meaning of Section 27A
of the Securities Act and Section 2B of the Exchange Act. For this purpose, any
statements contained herein or incorporated herein that are not statements of
historical fact may be deemed to be forward-looking statements. Without limiting
the foregoing, the words "believes," "plans," "expects" and similar expressions
are intended to identify forward-looking statements. There are a number of
important factors that could cause the results of the Company to differ
materially from those indicated by such forward-looking statements. These
factors include those set forth in "Risk Factors" herein.



                                       -3-

<PAGE>   6

                                   THE COMPANY


     The mission of OraVax, Inc. ("OraVax" or the "Company") is the discovery,
development and commercialization of biologic products for the prevention or
treatment of human infectious diseases. The Company's products are vaccines that
stimulate the body's own immunity to provide long term protection against
disease, as well as antibody products that provide immediate passive immunity to
treat existing infections or to protect against an acute disease risk. The
Company employs both classical biologic product methods and innovative
technologies to produce therapeutics and preventatives that meet the challenges
of each infection and disease process.

     The Company was incorporated in Delaware in 1990 and has its principal
offices and laboratories at 38 Sidney Street, Cambridge, Massachusetts
(telephone: 617-494-1339).




                                       -4-

<PAGE>   7


                                  RISK FACTORS


     The shares of Common Stock offered hereby include a high degree of risk.
The following risk factors should be considered carefully in addition to the
other information included or incorporated by reference in this Prospectus
before purchasing the Shares offered hereby.

     Early Stage of Product Development. The products under development by the
Company will require significant additional research and development efforts,
including extensive clinical testing and regulatory approval, prior to
commercial use. The Company's potential products are subject to the risks of
failure inherent in the development of pharmaceutical products based on new
technologies. These risks include the possibilities that the Company's
therapeutic approach will not be successful, that any or all of the Company's
potential products will be found to be unsafe, ineffective, toxic or otherwise
fail to meet applicable regulatory standards or receive necessary regulatory
clearances, that the potential products, if safe and effective, will be
difficult to develop into commercially viable products, to manufacture on a
large scale or be uneconomical to market, that proprietary rights of competitors
or other parties will preclude the Company from marketing such products; or that
competitors or other parties will market superior or equivalent products.

     Future Capital Needs. In addition, the Company will require substantial
additional funds in order to continue its research and development programs,
preclinical and clinical testing of its product candidates and to conduct full
scale manufacturing and marketing of any pharmaceutical products that may be
developed. The Company's capital requirements depend on numerous factors,
including but not limited to the progress of its research and development
programs, the progress of preclinical and clinical testing, the time and costs
involved in obtaining regulatory approvals, the cost of filing, prosecuting,
defending and enforcing any patent claims and other intellectual property
rights, competing technological and market developments, changes in the
Company's existing research relationships, the ability of the Company to
establish collaborative arrangements, the development of commercialization
activities and arrangements, and the purchase of additional facilities and
capital equipment. The Company believes, based upon its current operating plan,
that, in addition to its available cash balances and known revenues, it will
need additional financing, in the second half of 1998, in order to fund the
Company's planned operations. Possible sources of capital include strategic
corporate partnerships and private equity financing, both of which the Company
is actively pursuing. There can be no assurance, however, that changes in the
Company's research and development plans, acquisitions or other events affecting
the Company's operations will not result in accelerated or unexpected
expenditures. Thereafter, the Company will need to raise substantial additional
capital to fund its operations. There can be no assurance, however, that
additional financing will be available, or if available, will be available on
acceptable or affordable terms.

     Manufacturing Limitations. At present, the Company's ability to manufacture
its products is limited to clinical trial quantities. The Company does not have
the capability to manufacture commercial quantities of products. The Company's
long-term strategy is to develop manufacturing facilities for producing both
pilot-scale and commercial quantities of its products. To ensure compliance with
current Good Manufacturing Practices ("cGMP") imposed by the FDA, OraVax will
need to establish sufficient technical staff to oversee all product operations,
including quality control, quality assurance, technical support and
manufacturing management. The Company may enter into arrangements with contract
manufacturing companies to expand its own production capacity in order to meet
requirements for its product candidates. If the Company chooses to contract for
manufacturing services and encounters delays or difficulties in establishing
relationships with manufacturers to produce, package and distribute its finished
pharmaceutical or other medical products (if any), clinical trials, market
introduction and subsequent sales of such products would be adversely affected.
Moreover, contract manufacturers must operate in compliance with cGMP. The
Company's potential dependence upon third parties for the manufacture of its
products may adversely


                                       -5-

<PAGE>   8



affect the Company's profit margins and its ability to develop and deliver such
products on a timely and competitive basis.

     Risks Associated with Collaborative Arrangements. The Company's product
development strategy may require the Company to enter into various additional
arrangements with corporate, government and academic collaborators, licensors,
licensees and others. Therefore, the Company may be dependent upon the
subsequent success of these outside parties in performing their
responsibilities. There can be no assurance that the Company will be able to
establish additional collaborative arrangements or license agreements that the
Company deems necessary or acceptable to develop and commercialize its potential
pharmaceutical products or that such collaborative arrangements or license
agreements will be successful.

     Patent and Proprietary Rights. The Company seeks to protect its trade
secrets and proprietary know-how, in part, through confidentiality agreements
with its employees, consultants, advisors and collaborators. There can be no
assurance that these agreements will not be violated by the other parties, that
OraVax will have adequate remedies for any breach, or that the Company's trade
secrets will not otherwise become known or be independently developed by
competitors. Certain of the technology that may be used in the products of
OraVax is not covered by any patent applications relating to the Company's
product candidates will result in patents being issued. Moreover, there can be
no assurance that any such patents will afford protection against competitors
with similar technology. There may be pending or issued third-party patents
relating to the product candidates of OraVax. OraVax may need to acquire
licenses to, or to contest validity of, any such third party patents. It is
likely that significant funds would be required to defend any claim that OraVax
infringes a third-party patent, and any such claim could adversely affect sales
of the challenged product of OraVax until the claim is resolved. There can be no
assurance that any license required under any such patent would be made
available.

     Government Regulation. The rigorous preclinical and clinical testing
requirements and regulatory approval process of the FDA and of foreign
regulatory authorities can take a number of years and require the expenditure of
substantial resources. The Company has limited experience in conducting and
managing preclinical and clinical testing necessary to obtain government
approvals. There can be no assurance that the Company will be able to obtain the
necessary approvals for clinical testing or for the manufacturing and marketing
of any products that it develops. Additional government regulation may be
established that could prevent or delay regulatory approval of the Company's
product candidates. Delays in obtaining regulatory approvals would adversely
affect the marketing of any products developed by the Company and the Company's
ability to receive product revenues or royalties. If regulatory approval of a
potential product is granted, such approval may include significant limitations
on the indications for which such product may be marketed. Even if initial
regulatory approvals for the Company's product candidates are obtained, the
Company, its products and its manufacturing facilities are subject to continual
review and periodic inspection. The regulatory standards for manufacturing are
applied stringently by the FDA. Discovery of previously unknown problems with a
product, manufacturer or facility may result in restrictions on such product or
manufacturer or facility, including warning letters, fines, suspensions of
regulatory approvals, product recalls, operating restrictions, delays in
obtaining new product approvals, product recalls, operating restrictions, delays
in obtaining new product approvals, withdrawal of the product from the market,
and criminal prosecution. Other violations of FDA requirements can result in
similar penalties.

     Uncertainty of Third-Party Reimbursement. Government and other third-party
payers are increasingly attempting to contain healthcare costs by limiting both
coverage and the level of reimbursement for new products approved for marketing
by the FDA and by refusing, in some cases, to provide any coverage for uses of
approved products for disease indications for which the FDA has



                                       -6-

<PAGE>   9



not granted marketing approval. If adequate coverage and reimbursement levels
are not provided by government and third party payers for uses of the Company's
products, the market acceptance of these products would be adversely affected.

     Year 2000 Issues. The approaching millennium ("Year 2000") could result in
challenges related to the Company's computer software, accounting records and
relationships with suppliers, collaborative partners and licensees. Management
of the Company is studying Year 2000 issues and is seeking to avoid such
problems. Based on the Company's review of its business and operating systems,
the Company does not expect to incur material costs with respect to assessing
and remediating Year 2000 problems; however, there can be no assurance that such
problems will not be encountered or that the costs incurred to resolve such
problems will not be material.



                                       -7-

<PAGE>   10


                                 USE OF PROCEEDS

     The Company will not receive any proceeds from the sale of Common Stock by
the Selling Stockholders.


                             THE PURCHASE AGREEMENTS

     On December 23, 1997, the Company completed a private placement of 240,000
shares (the "Shares") of Common Stock pursuant to which it received gross
proceeds of $459,000. All of the Shares were sold in private placements solely
to accredited investors under the Securities Act. The Company is obligated to
register the Shares for resale under the Securities Act and is doing so herein.

     The placement agent for the private placement described above was Cappello
Capital Corp. (the "Placement Agent"). In consideration for its services, the
Placement Agent received aggregate cash compensation of 8.5% of the gross
proceeds received by the Company, or $39,015, and certain designees of the
Placement Agent received warrants (the "Warrants") to acquire an aggregate of
24,000 shares of Common Stock for a purchase price of $1.9125 per share. The
Company is obligated to register the shares of Common Stock issuable upon
exercise of the Warrants for resale under the Securities Act and is doing so
herein.




                                       -8-

<PAGE>   11


                            THE SELLING STOCKHOLDERS

     The following table sets forth the name and the number of shares of Common
Stock beneficially owned by each of the Selling Stockholders as of July 1, 1998,
the number of the shares to be offered by each of the Selling Stockholders and
the number and percentage of shares to be owned beneficially by each of the
Selling Stockholders if all of the shares offered hereby by the Selling
Stockholders are sold as described herein.


<TABLE>
<CAPTION>

                                Number of Shares of                                  Number of Shares            Percentage of
                                    Common Stock           Number of Shares           of Common Stock          Shares of Common
             Name of             Beneficially Owned         of Common Stock         Beneficially Owned         Stock Owned After
       Selling Stockholder       Prior to Offering         Offered Hereby(1)          After Offering              Offering(2)
       -------------------      -------------------        -----------------        ------------------         -----------------
<S>                                   <C>                       <C>                      <C>                         <C>
DFA Group Trust - Small
   Company Subtrust                   126,000                   126,000                     --                        --

U.S. 9-10 Small Company
   Portfolio                           59,400                    59,400                     --                        --

DFA Group Trust - 6-10
   Subtrust                            49,100                    49,100                     --                        --

Linda S. Cappello                     427,394(3)                 10,800                  416,594(3)                  3.7%

Gerard K. Cappello                    321,549(4)                  7,200                  314,349(4)                  2.8%

Lawrence K. Fleischman                177,859(5)                  6,000                  171,859(5)                  1.6%

U.S. 6-10 Small Company
   Series                               5,500                     5,500                     --                        --
</TABLE>

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

(1)  The actual number of shares of Common Stock offered hereby is subject to
     adjustment and could be materially more than the amount indicated depending
     upon application of the anti-dilution provisions of the Purchase Agreements
     to sales of additional shares of Common Stock by the Company.

(2)  Assumes no purchase of additional shares of Common Stock.

(3)  Includes 416,594 shares of Common Stock issuable as of July 1, 1998 upon
     conversion of shares of the Company's 6% Convertible Preferred Stock
     beneficially held by Ms. Cappello.

(4)  Includes 314,349 shares of Common Stock issuable as of July 1, 1998 upon
     conversion of shares of the Company's 6% Convertible Preferred Stock
     beneficially held by Mr. Cappello.

(5)  Includes 171,859 shares of Common Stock issuable as of July 1, 1998 upon
     conversion of shares of the Company's 6% Convertible Preferred Stock
     beneficially held by Mr. Fleischman.



                                       -9-

<PAGE>   12


                              PLAN OF DISTRIBUTION


     Shares of Common Stock covered hereby may be offered and sold from time to
time by the Selling Stockholders. The Selling Stockholders will act
independently of the Company in making decisions with respect to the timing,
manner and size of each sale. Such sales may be made in the over-the-counter
market or otherwise, at prices related to the then current market price or in
negotiated transactions, including pursuant to an underwritten offering or one
or more of the following methods: (a) purchases by a broker-dealer as principal
and resale by such broker or dealer for its account pursuant to this Prospectus;
(b) ordinary brokerage transactions and transactions in which the broker
solicits purchasers; and (c) block trades in which the broker-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. In effecting sales,
broker-dealers engaged by the Selling Stockholders may receive commissions or
discounts from the Selling Stockholders in amounts to be negotiated immediately
prior to the sale. The Purchase Agreements provides that the Company will
indemnify the Selling Stockholders against certain liabilities, including
liabilities under the Securities Act.

     In offering the shares of Common Stock covered hereby, the Selling
Stockholders and any broker-dealers and any other participating broker-dealers
who execute sales for the Selling Stockholders may be deemed to be
"underwriters" within the meaning of the Securities Act in connection with such
sales, and any profits realized by the Selling Stockholders and the compensation
of such broker-dealer may be deemed to be underwriting discounts and
commissions.

     The Company has advised the Selling Stockholders that during such time as
they may be engaged in a distribution of Common Stock included herein they are
required to comply with Rules 10b-6 and 10b-7 under the Exchange Act and, in
connection therewith, that they may not engage in any stabilization activity in
connection with the Company's securities, are required to furnish to each
broker-dealer through which Common Stock included herein may be offered copies
of this Prospectus, and may not bid for or purchase any securities of the
Company or attempt to induce any person to purchase any securities of the
Company except as permitted under the Exchange Act.

     Rule 10b-6 under the Exchange Act prohibits, with certain exceptions,
participants in a distribution from bidding for or purchasing, for an account in
which the participant has a beneficial interest, any of the securities that are
the subject of the distribution. Rule 10b-7 governs bids and purchases made in
order to stabilize the price of a security in connection with a distribution of
the security.

     This offering will terminate on the date on which all shares offered hereby
have been sold by the Selling Stockholders.



                                      -10-

<PAGE>   13


                                  LEGAL MATTERS


     The validity of the shares offered hereby will be passed upon for the
Company by Hale and Dorr LLP, 60 State Street, Boston, Massachusetts 02109.


                                     EXPERTS

     The consolidated balance sheets of the Company as of December 31, 1996 and
1997 and the consolidated statements of operations, stockholders' equity
(deficit) and cash flows for each of the three years in the period ended
December 31, 1997, all appearing in the Company's Annual Report on Form 10-K
have been audited by PricewaterhouseCoopers LLP, independent accountants, as set
forth in their report thereon included therein and incorporated herein by
reference. Such consolidated financial statements are incorporated herein by
reference in reliance upon such firm given upon their authority as experts in
accounting and auditing.

     The combined financial statements of OraVax Merieux Co. and Merieux OraVax
Co. appearing in the Company's Annual Report on Form 10-K have been audited by
PricewaterhouseCoopers LLP, as set forth in their report thereon included
therein and incorporated herein by reference. Such combined financial
statements are incorporated herein by reference in reliance upon such firm
given upon their authority as experts in accounting and auditing.




                                      -11-

<PAGE>   14

================================================================================

     NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR THE SELLING
STOCKHOLDER. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A
SOLICITATION OF ANY OFFER TO BUY TO ANY PERSON IN ANY JURISDICTION IN WHICH SUCH
OFFER OR SOLICITATION OF AN OFFER OR SOLICITATION WOULD BE UNLAWFUL. NEITHER THE
DELIVERY OF THIS PROSPECTUS NOR ANY OFFER OR SALE HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY OR THAT THE INFORMATION CONTAINED HEREIN IS CORRECT AS OF
ANY DATE HEREOF.

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

<TABLE>
<CAPTION>
                                TABLE OF CONTENTS
                                                                         Page
                                                                         ----
<S>                                                                      <C>
Available Information..................................................   2
Incorporation of Certain Documents
    By Reference.......................................................   2
Special Note Regarding Forward-Looking
  Information..........................................................   3
The Company............................................................   4
Risk Factors...........................................................   5
Use of Proceeds........................................................   8
The Purchase Agreements................................................   8
The Selling Stockholders...............................................   9
Plan of Distribution...................................................  10
Legal Matters..........................................................  11
Experts................................................................  11
</TABLE>

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


================================================================================

================================================================================





                                  ORAVAX, INC.


                                 264,000 SHARES
                                  COMMON STOCK










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

                                   PROSPECTUS

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









                                 _________, 1998


================================================================================

<PAGE>   15



                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

     The following table sets forth the various expenses to be incurred in
connection with the sale and distribution of the securities being registered
hereby, all of which will be borne by the Company. All amounts shown are
estimates except the Securities and Exchange Commission registration fee.


<TABLE>
<S>                                                                   <C>
Filing Fee - Securities and Exchange                                     $77
    Commission
Legal fees and expenses of the                                        $3,000
    Company
Accounting fees and expenses                                          $3,000
Blue Sky fees and expenses                                                --
Printing expenses                                                         --
Miscellaneous expenses                                                  $423

Total Expenses                                                        $6,500
</TABLE>




                                      II-1

<PAGE>   16



Item 15.  Indemnification of Directors and Officers.


     Article EIGHTH of the Registrant's Amended and Restated Certificate of
Incorporation (the "Restated Certificate of Incorporation") provides that no
director of the Registrant shall be personally liable for any monetary damages
for any breach of fiduciary duty as a director, except to the extent that the
Delaware General Corporation Law prohibits the elimination or limitation of
liability of directors for breach of fiduciary duty.

     Article NINTH of the Registrant's Restated Certificate of Incorporation
provides that a director or officer of the Registrant (a) shall be indemnified
by the Registrant against all expenses (including attorneys' fees), judgments,
fines and amounts paid in settlement incurred in connection with any litigation
or other legal proceeding (other than an action by or in the right of the
Registrant) brought against him by virtue of his position as a director or
officer of the Registrant if he acted in good faith and in a manner he
reasonably believed to be in, or not opposed to, the best interests of the
Registrant, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful and (b) shall be
indemnified by the Registrant against all expenses (including attorneys' fees)
and amounts paid in settlement incurred in connection with any action by or in
the right of the Registrant brought against him by virtue of his position as a
director or officer of the Registrant if he acted in good faith and in a manner
he reasonably believed to be in, or not opposed to, the best interests of the
Registrant, except that no indemnification shall be made with respect to any
matter as to which such person shall have been adjudged to be liable to the
Registrant, unless a court determines that, despite such adjudication but in
view of all of the circumstances, he is entitled to indemnification of such
expenses. Notwithstanding the foregoing, to the extent that a director or
officer has been successful, on the merits or otherwise, including, without
limitation, the dismissal of an action without prejudice, he is required to be
indemnified by the Registrant against all expenses (including attorneys' fees)
incurred in connection therewith. Expenses shall be advanced to a director or
officer at his request, provided that he undertakes to repay the amount advanced
if it is ultimately determined that he is not entitled to indemnification for
such expenses.

     Indemnification is required to be made unless the Registrant determines
that the applicable standard of conduct required for indemnification has not
been met. In the event of a determination by the Registrant that the director or
officer did not meet the applicable standard of conduct required for
indemnification, or if the Registrant fails to make an indemnification payment
within 60 days after such payment is claimed by such person, such person is
permitted to petition the court to make an independent determination as to
whether such person is entitled to indemnification. As a condition precedent to
the right of indemnification, the director or officer must give the Registrant
notice of the action for which indemnity is sought and the Registrant has the
right to participate in such action or assume the defense thereof.

     Article NINTH of the Registrant's Restated Certificate of Incorporation
further provides that the indemnification provided therein is not exclusive, and
provides that in the event that the Delaware General Corporation Law is amended
to expand the indemnification permitted to directors or officers the Registrant
must indemnify those persons to the fullest extent permitted by such law as so
amended.

     Section 145 of the Delaware General Corporation Law provides that a
corporation has the power to indemnify a director, officer, employee or agent of
the corporation and certain other persons serving at the request of the
corporation in related capacities against amounts paid and expenses incurred in
connection with an action or proceeding to which he is or is threatened to be
made a party by reason of such position, if such person shall have acted in good
faith and in a manner he reasonably believed to be in or not opposed to the best
interests of the corporation, and,



                                      II-2

<PAGE>   17



in any criminal proceeding, if such person had no reasonable cause to believe
his conduct was unlawful; provided that, in the case of actions brought by or in
the right of the corporation, no indemnification shall be made with respect to
any matter as to which such person shall have been adjudged to be liable to the
corporation unless and only to the extent that the adjudicating court determines
that such indemnification is proper under the circumstances.

     The Company maintains a general liability insurance policy which covers
certain liabilities of directors and officers of the Company arising out of
claims based on acts or omissions in their capacities as directors or officers.


ITEM 16.  LIST OF EXHIBITS.


5       Opinion of Hale and Dorr LLP.

23.1    Consent of Hale and Dorr LLP, included in Exhibit 5 filed herewith.

23.2    Consent of PricewaterhouseCoopers LLP

24      Power of Attorney (See page II-5 of this Registration Statement).

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


ITEM 17.  UNDERTAKINGS.

     The undersigned Registrant hereby undertakes:

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

          (i) To include any prospectus required by Section 10(a)(3) of the
     Securities Act of 1933, as amended (the "Securities Act");

          (ii) To 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. Notwithstanding the foregoing, any increase or
     decrease in the volume of securities offered (if the total dollar value of
     securities offered would not exceed that which was registered) and any
     derivation from the low or high and of the estimated maximum offering range
     may be reflected in the form of prospectus filed with the Commission
     pursuant to Rule 424(b) if, in the aggregate, the changes in volume and
     price represent no more than 20 percent change in the maximum aggregate
     offering price set forth in the "Calculation of Registration Fee" table in
     the Registration Statement; and

          (iii) To 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;

     provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if the
     information required to be included in a post-effective amendment by those
     paragraphs is contained in periodic



                                      II-3

<PAGE>   18


     reports filed by the Company pursuant to Section 13 or Section 15(d) of the
     Securities Exchange Act of 1934, as amended (the "Exchange Act"), that are
     incorporated by reference in this Registration Statement.

     (2)  That, for the purposes 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 the 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.

     The Company hereby undertakes that, for purposes of determining any
liability under the Securities Act, each filing of the Company's annual report
pursuant to Section 13(a) or 15(d) of the Exchange Act (and, where applicable,
each filing of an employee benefit plan's annual report pursuant to Section
15(d) of the Exchange Act) that is incorporated by reference in this
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered therein and the offering of such securities
at the time shall be deemed to be the initial bona fide offering thereof.

     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Corporation pursuant to the indemnification provisions described herein, 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 Securities 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 whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.




                                      II-4

<PAGE>   19


                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, 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 Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Cambridge, Commonwealth of Massachusetts, on this
31st day of July, 1998.


                                     ORAVAX, INC.



                                     By: /s/ Lance K. Gordon
                                         --------------------------------------
                                         Lance K. Gordon
                                         President and Chief Executive Officer



                                POWER OF ATTORNEY


     We, the undersigned officers and directors of OraVax, Inc., hereby
severally constitute Lance K. Gordon, Brigid A. Makes and John M. Westcott, Jr.,
and each of them singly, our true and lawful attorneys with full power to any of
them, and to each of them singly, to sign for us and in our names in the
capacities indicated below the Registration Statement on Form S-3 filed herewith
and any and all pre-effective and post-effective amendments to said Registration
Statement and generally to do all such things in our name and behalf in our
capacities as officers and directors to enable OraVax, Inc. to comply with the
provisions of the Securities Act and all requirements of the Securities and
Exchange Commission, hereby ratifying and confirming our signatures as they may
be signed by our said attorneys, or any of them, to said Registration Statement
and any and all amendments thereto.



                                      II-5

<PAGE>   20


     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the date indicated.


<TABLE>
<CAPTION>

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

<S>                                         <C>                                           <C>
/s/ Lance K. Gordon                         President, Chief Executive Officer and        July 31, 1998
- ----------------------------------          Director (Principal Executive Officer)
Lance K. Gordon                             


/s/ Brigid A. Makes                         Vice President, Finance, and Chief            July 31, 1998
- ----------------------------------          Financial Officer (Principal Financial
Brigid A. Makes                             and Accounting Officer)                 


/s/ C. Boyd Clarke                          Director                                      July 31, 1998
- ----------------------------------
C. Boyd Clarke


/s/ Andre L. Lamotte                        Director                                      July 31, 1998
- ----------------------------------
Andre L. Lamotte


/s/ Douglas MacMaster                       Director                                      July 31, 1998
- ----------------------------------
Douglas MacMaster


/s/ Allen Misher                            Director                                      July 31, 1998
- ----------------------------------
Allen Misher

</TABLE>




                                      II-6


<PAGE>   1

                                                                       EXHIBIT 5


                                HALE AND DORR LLP
                                 60 State Street
                                Boston, MA 02109



                                  July 31, 1998


OraVax, Inc.
38 Sidney Street
Cambridge, MA 02139

Ladies and Gentlemen:

     We have assisted in the preparation of the Registration Statement on Form
S-3 (the "Registration Statement") filed with the Securities and Exchange
Commission (the "Commission") under the Securities Act of 1933, as amended (the
"Securities Act"), relating to 264,000 shares (the "Shares") of common stock,
$.001 par value per share, of OraVax, Inc., a Delaware corporation (the
"Company"). The Registration Statement has been filed to cover the resale of the
Shares by certain accredited investors under the several Stock Purchase
Agreements between the Company and each of such accredited investors
(collectively, the "Agreement").

     We have examined the Second Amended and Restated Certificate of
Incorporation and the Amended and Restated By-Laws of the Company and all
amendments thereto and have examined and relied on the originals, or copies
certified to our satisfaction, of such records of meetings, written actions in
lieu of meetings, or resolutions adopted at meetings, of the directors and
stockholders of the Company, all as provided to us by the Company, and such
other documents and instruments as in our judgment are necessary or appropriate
to enable us to render the opinions expressed below.

     In our examination of the foregoing documents, we have assumed (i) the
genuineness of all signatures and the authenticity of all documents submitted to
us as originals, (ii) the conformity to the originals of all documents submitted
to us as certified or photostatic copies, (iii) the authenticity of the
originals of the latter documents, and (iv) the legal competence of all
signatures to such documents.

     We express no opinion herein as to the laws of any state or jurisdiction
other than the state laws of the Commonwealth of Massachusetts, the Delaware
General Corporation Law statute and the federal laws of the United States of
America.

     Based upon and subject to the foregoing, we are of the opinion that the
Shares have been duly authorized and are validly issued, fully paid and
non-assessable.

     It is our understanding that this opinion is to be used only in connection
with the offer and sale of the Shares while the Registration Statement is in
effect.

     We hereby consent to the filing of this opinion with the Commission as an
exhibit to the Registration Statement in accordance with the requirements of
Item 601(b)(5) of Regulation S-K under the Securities Act and to the use of our
name therein and in the related Prospectus under the caption "Legal Matters." In
giving such consent, we do not hereby admit that we are in the category of
persons whose consent is required under Section 7 of the Securities Act or the
rules and regulations of the Commission.

                                  Very truly yours,

                                  /s/ Hale and Dorr LLP

                                  HALE AND DORR LLP


<PAGE>   1


                                                                    EXHIBIT 23.2





                       CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in this registration statement of
OraVax, Inc. on Form S-3 to register 264,000 shares of common stock of our
report dated March 27, 1998, on our audits of the consolidated financial        
statements of OraVax, Inc. as of December 31, 1996 and 1997 and for each of the
three years in the period ended December 31, 1997, which report is included in
the Annual Report on Form 10-K of OraVax, Inc. 

We also consent to the incorporation by reference in this registration statement
of our report, dated March 27, 1998, on our audits of the combined financial
statements of OraVax Merieux Co. and Merieux OraVax Co. (both development stage
enterprises) as of December 31, 1996 and 1997 and for the period from inception
(March 31, 1995) through December 31, 1995 and for the years ended December 31,
1996 and 1997, which report is also included in the 1997 Annual Report on 
Form 10- K of OraVax, Inc. We also consent to the references to our firm under 
the caption "Experts."


                                               PricewaterhouseCoopers LLP

Boston, Massachusetts
July 31, 1998




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