EXHIBIT 4
                             CERTIFICATE OF MERGER

                                       OF

                        NORTH AMERICAN BIOLOGICALS, INC.

                                      AND

                             UNIVAX BIOLOGICS, INC.



          Pursuant to the provisions of Section 251 of the Delaware General
Corporation Law, the domestic corporations herein named do hereby adopt the
following Certificate of Merger:

          1.  The names of the constituent corporations are North American
Biologicals, Inc. and Univax Biologics, Inc., both of which are business
corporations organized under the laws of the State of Delaware and are subject
to the provisions of the Delaware General Corporation Law.

          2.  An Agreement and Plan of Merger dated August 28, 1995 between
North American Biologicals, Inc. and Univax Biologics, Inc. was approved,
adopted, certified, executed and acknowledged by each of the constituent
corporations in accordance with Section 251 of the Delaware General Corporation
Law.

          3.  The name of the surviving corporation is North American
Biologicals, Inc.

          4.  Article FOURTH of the Restated Certificate of Incorporation of
North American Biologicals, Inc. is hereby amended by deleting the first
paragraph therein and inserting in place thereof the following:

          "The total number of shares of all classes of stock which the
Corporation shall have the authority to issue is 80,000,000 shares consisting of
 
          a) 5,000,000 shares of Preferred Stock, par value $.10 per share and

          b) 75,000,000 shares of Common Stock, par value $.10 per share."

The remainder of Article FOURTH remains in full force and effect.

          The foregoing amendment was duly adopted by the stockholders of North
American Biologicals, Inc. on November 29, 1995, in accordance with the
provisions of Section 242 of the General Corporation Law of the State of
Delaware.

 
          5.  The executed Agreement and Plan of Merger is on file at the
principal place of business of North American Biologicals, Inc., 5800 Park of
Commerce Boulevard, N.W., Boca Raton, Florida 33487.

          6.  A copy of the Agreement and Plan of Merger will be furnished by
North American Biologicals, Inc., on request and without cost, to any
stockholder of either constituent corporation.


Effective November 29, 1995.

                                       NORTH AMERICAN BIOLOGICALS, INC.


                                       By:  /s/ David J. Gury         
                                            ----------------------------------- 
                                            David J. Gury
                                            President