Haffkine Bio-Pharmaceutical Corporation Ltd. Offers Anti Diphtheria Serum Made from Equine Blood. Haffkine Bio-Pharmaceutical Corporation Ltd. Manufactures wide range of bacterial and viral vaccines for diphtheria, tetanus, whooping cough, plague, poliomyelitis and rabies. Anti Diphtheria Serum Made From Equine Blood is prepared by hyperimmunizing horses with diphtheria toxin, blood plasma obtained from the hyperimmunised horses which is rich in antibodies to diphtheria toxin is enzyme refined, purified and concentrated. Anti Diphtheria Serum Made from Equine Blood has the specific power of neutralising the toxin secreted by corynebacterium diphtherea the causative organism of diphtherea. This vaccine is used as passive immunizing agent. It is available in ampoules ranging from 1 ml. To 10 ml.