Haffkine Bio-Pharmaceutical Corporation Ltd. Supplies Enzyme Refined Equine Immunoglobulin Anti Rabies Serum. Haffkine Bio-Pharmaceutical Corporation Ltd. Supplies wide range of bacterial and viral vaccines for diphtheria, tetanus, whooping cough, plague, poliomyelitis and rabies. Enzyme Refined Equine Immunoglobulin Anti Rabies Serum is of equine origin derived from the plasma of the horses, ponies, mules that have been hyperimmunized against rabies. Enzyme Refined Equine Immunoglobulin Anti Rabies Serum is obtained from plasma contains purified, enzyme-refined and concentrated specific immunoglobulins. It is used as a passive immunizing agent and affords protection to the persons suspected of exposure to rabies. This vaccine is available in the pack of 1, 5, 10, 20 vials.