Immunization against cobra venom using Mucuna pruriens derived serum immunoglobulins was carried out in a mouse model. The neutralizing ability of circulating antibodies was assessed by challenging the immunized mice with a minimum lethal dose of purified venom after 4, 24, 72 and 168 h. The single injection of the antibody preparation produced a high and sustained immune response with high survival rates of treated animals. (C) 1999 Elsevier Science B.V. All rights reserved.