a Company no longer produces any vaccines.
b Connaught Laboratories, Inc., (U.S.) and Connaught Laboratories, Ltd (Canada), are subsidiaries of Pasteur-Mérieux Sérums et Vaccins (France).
c Evans-Medical is a division of Medeva International, plc (United Kingdom); Medeva International plc acquired the vaccine business from Wellcome in 1991.
d Lederle Laboratories acquired Praxis Biologics in 1989. Lederle-Praxis Biologicals is now a business unit of American Cyanamid.
e Company produces one vaccine only for U.S. market.
f Sclavo spa is now owned by Ciba-Geigy (Switzerland) and Chiron (U.S.).
SOURCE: Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Bethesda, Maryland.