An attempt to immunise dogs against Taenia hydatigena.

An attempt was made to immunise dogs against Taenia hydatigena. Worms were cultured in vitro and macromolecular secretions were collected, concentrated and injected in a water-in-oil emulsion into dogs. A high serum antibody titre to these antigens was stimulated but no immunity was induced to a challenge infection of five cysticerci. There was no change in antibody titre following acquisition of the challenge infection. Dogs varied markedly in their susceptibility to this parasite.