Feline vaccine compositions and method for preventing chlamydia infections or diseases using the same

This invention provides a feline vaccine composition comprising an immunogenically active component having inactivated mammalian chlamydial cells or antigens derived therefrom, in combination with an effective amount of an immunogencally suitable adjuvant; and a veterinary pharmaceutically acceptable carrier or diluent. The vaccine composition is useful to prevent chlamydia, e.g. C. psittaci, infections or diseases in felines, and may also be combined with other vaccine compositions or therapy. A process for producing C. psittaci suitable for use in the production of safe and effective chlamydia vaccines, and a method for preventing chlamydia infections or diseases in felines, are also provided.