Streptococcal OK 432
Streptococcal Preparation OK 432
Streptococcal Preparation OK-432
Streptococcal Preparation OK432
A lyophilized preparation of a low-virulence strain (SU) of Streptococcus pyogenes (S. hemolyticus), inactivated by heating with penicillin G. It has been proposed as a noncytotoxic antineoplastic agent because of its immune system-stimulating activity.