VIRUS RESEARCH INSTITUTE INC
SC 13G, 1998-05-08
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>

                          SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, DC  20549


                                     SCHEDULE 13G
                                  (RULE 13d-102)(b)


               INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
             TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
                                  PURSUANT TO 13d-2

                                (AMENDMENT NO. __)(1)

                            VIRUS RESEARCH INSTITUTE INC.
                            -----------------------------
                                   (Name of Issuer)

                                     COMMON STOCK
                                     ------------
                            (Title of Class of Securities)

                                     92792 0 108
                                     -----------
                                    (CUSIP Number)


                                    APRIL 29, 1998
                                    --------------
               (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

           / /    Rule 13d-1(b)
           /X/    Rule 13d-1(c)
           / /    Rule 13d-1(d)

(1)   The remainder of this cover page shall be filled out for a reporting 
person's initial filing on this form with respect to the subject class of 
securities, and for any subsequent amendment containing information which 
would alter disclosures provided in a prior cover page.

     The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, SEE the
NOTES).

<PAGE>
- ---------------------------------            ---------------------------------
 CUSIP NO.  92792 0 108               13G     Page 2 of 7 Pages
- ---------------------------------            ---------------------------------

- -------------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON:
            BIOTECHNOLOGY VALUE FUND, L.P.
       I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY):
            
- -------------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a) /X/ (b) / /
- -------------------------------------------------------------------------------
  3    SEC USE ONLY

- -------------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION
            DELAWARE
- -------------------------------------------------------------------------------
      NUMBER        
                    5  SOLE VOTING POWER
        OF
                            0
      SHARES       ------------------------------------------------------------
                    6  SHARED VOTING POWER
   BENEFICIALLY
                            556,849
  OWNED BY EACH    ------------------------------------------------------------
                    7  SOLE DISPOSITIVE POWER
    REPORTING       
                            0
      PERSON       ------------------------------------------------------------
                    8  SHARED DISPOSITIVE POWER
       WITH        
                            556,849
- -------------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            556,849
- -------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
       CERTAIN SHARES*                                                         
- -------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
            6.2%
- -------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*
            PN
- -------------------------------------------------------------------------------

                        * SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

- ---------------------------------            ---------------------------------
 CUSIP NO.  92792 0 108               13G     Page 3 of 7 Pages
- ---------------------------------            ---------------------------------

- -------------------------------------------------------------------------------
  1   NAME OF REPORTING PERSON:
           BVF PARTNERS L.P.
      I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY):
           
- -------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a) /X/ (b) / /

- -------------------------------------------------------------------------------
  3   SEC USE ONLY

- -------------------------------------------------------------------------------
  4   CITIZENSHIP OR PLACE OF ORGANIZATION
           DELAWARE
- -------------------------------------------------------------------------------
      NUMBER       5   SOLE VOTING POWER

        OF                  0
                  -------------------------------------------------------------
      SHARES       6   SHARED VOTING POWER
                   
   BENEFICIALLY             1,143,099
                  -------------------------------------------------------------
  OWNED BY EACH    7   SOLE DISPOSITIVE POWER

    REPORTING               0
                  -------------------------------------------------------------
      PERSON       8   SHARED DISPOSITIVE POWER

       WITH                 1,143,099
- -------------------------------------------------------------------------------
  9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           1,143,099
- -------------------------------------------------------------------------------
  10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
      CERTAIN SHARES*                                                          
- -------------------------------------------------------------------------------
  11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
           12.8%
- -------------------------------------------------------------------------------
  12  TYPE OF REPORTING PERSON*
           PN
- -------------------------------------------------------------------------------

                        * SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

- ---------------------------------            ---------------------------------
 CUSIP NO.  92792 0 108               13G     Page 4 of 7 Pages
- ---------------------------------            ---------------------------------

- -------------------------------------------------------------------------------
  1   NAME OF REPORTING PERSONS
           BVF INC.
      I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
           
- -------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                  (a)    (b)   
- -------------------------------------------------------------------------------
  3   SEC USE ONLY
- -------------------------------------------------------------------------------
  4   CITIZENSHIP OR PLACE OF ORGANIZATION
           DELAWARE
- -------------------------------------------------------------------------------
      NUMBER       5   SOLE VOTING POWER

        OF                  0
                   -------------------------------------------------------------
      SHARES       6   SHARED VOTING POWER
                   
   BENEFICIALLY
                            1,143,099
  OWNED BY EACH   -------------------------------------------------------------
                   7   SOLE DISPOSITIVE POWER
    REPORTING      
                            0
      PERSON      -------------------------------------------------------------
                   8   SHARED DISPOSITIVE POWER
       WITH
                            1,143,099
- -------------------------------------------------------------------------------
  9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           1,143,099
- -------------------------------------------------------------------------------
  10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
      CERTAIN SHARES*                                                          
- -------------------------------------------------------------------------------
  11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
           12.8%
- -------------------------------------------------------------------------------
  12  TYPE OF REPORTING PERSON*
           IA, CO
- -------------------------------------------------------------------------------

                        * SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

- ---------------------------------            ---------------------------------
 CUSIP NO.  92792 0 108               13G     Page 5 of 7 Pages
- ---------------------------------            ---------------------------------

ITEM 1(a). NAME OF ISSUER:

           Virus Research Institute Inc. ("VRI")

ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

           61 Moulton Street
           Cambridge, MA  02139

ITEM 2(a). NAME OF PERSON FILING:

           This schedule is being filed on behalf of the following persons*:

           (i)     Biotechnology Value Fund, L.P. ("BVF")
           (ii)    BVF Partners L.P.  ("Partners")
           (iii)   BVF Inc. ("BVF Inc.")

           *       Attached as Exhibit A is a copy of an agreement among the 
                   persons filing (as specified hereinabove) that this 
                   Schedule 13G is being filed on behalf of each of them.

ITEM 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE:

           The principal business office of the persons comprising the group
filing this Schedule 13G is located at 333 West Wacker Drive, Suite 1600,
Chicago, Illinois  60606.

ITEM 2(c). CITIZENSHIP:
          
           BVF:                     a Delaware limited partnership
           Partners:                a Delaware limited partnership
           BVF Inc.:                a Delaware corporation

ITEM 2(d). TITLE OF CLASS OF SECURITIES:

           The class of securities beneficially owned by the persons filing this
statement is common stock.

ITEM 2(e). CUSIP NUMBER:

           92792 0 108

ITEM 3.    IF THIS STATEMENT IS FILED PURSUANT TO RULE 13d-1(c), 
           CHECK THIS BOX:     /X/

<PAGE>

- ---------------------------------            ---------------------------------
 CUSIP NO.  92792 0 108               13G     Page 6 of 7 Pages
- ---------------------------------            ---------------------------------

ITEM 4.   OWNERSHIP:

          The information in items 1 and 5 through 11 on the cover pages
(pp. 2- 4) on Schedule 13G is hereby incorporated by reference.

ITEM 5.   OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

          If this statement is being filed to report the fact that as of the
date hereof the reporting person has ceased to be the beneficial owner of more
than five percent of the class of securities check the following.   

ITEM 6.   OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:

          BVF shares voting and dispositive power over the shares of the common
stock it beneficially owns with Partners.  Partners and BVF Inc. share voting
and dispositive power over the shares of the common stock they beneficially own
with, in addition to BVF, certain managed accounts on whose behalf Partners, as
investment manager, purchased such shares.  None of the managed accounts
individually owns more than 5% of the common stock of VRI.  

ITEM 7.   IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
          SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY:

          Not applicable.

ITEM 8.   IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF A GROUP:

          Not applicable.

ITEM 9.   NOTICE OF DISSOLUTION OF GROUP:

          Not applicable.

ITEM 10.  CERTIFICATION

          By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.

<PAGE>

- ---------------------------------            ---------------------------------
 CUSIP NO.  92792 0 108               13G     Page 7 of 7 Pages
- ---------------------------------            ---------------------------------

          After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated: May 8, 1998


     BIOTECHNOLOGY VALUE FUND, L.P.

     By:  BVF Partners L.P., its general partner

          By:  BVF Inc., its general partner


               By:  /s/ Mark N. Lampert            
                    -------------------------------
                    Mark N. Lampert
                    President

     BVF PARTNERS L.P.

     By:  BVF Inc., its general partner


          By:  /s/ Mark N. Lampert            
               -------------------------------
               Mark N. Lampert
               President

     BVF INC.


     By:  /s/ Mark N. Lampert            
          -------------------------------
          Mark N. Lampert
          President

<PAGE>

                                     EXHIBIT A

                           AGREEMENT REGARDING JOINT FILING


     The undersigned, Biotechnology Value Fund, L.P., a Delaware limited
partnership, and BVF Partners L.P., a Delaware limited partnership, and BVF
Inc., a Delaware corporation, hereby agree and acknowledge that the information
required by Schedule 13G, to which this Agreement is attached as an exhibit, is
filed on behalf of each of them.  The undersigned further agree that any
amendments or supplements thereto shall also be filed on behalf of each of them.

Dated: May 8, 1998

     BIOTECHNOLOGY VALUE FUND, L.P.

     By:  BVF Partners L.P., its general partner

          By:  BVF Inc., its general partner


               By:  /s/ Mark N. Lampert            
                    -------------------------------
                    Mark N. Lampert
                    President

     BVF PARTNERS L.P.

     By:  BVF Inc., its general partner


          By:/s/ Mark N. Lampert            
             -------------------------------
               Mark N. Lampert
               President

     BVF INC.


     By:  /s/ Mark N. Lampert            
          -------------------------------
          Mark N. Lampert
          President


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