Other

University of Kansas

Darmouth College

The Kansas University Endowment Association

Elmer R Pfefferkorn

Jacob K Frenkel

A new mutant strain vaccine, and a corresponding method of immunization, against Toxoplasma in cats is provided which makes use of a reproductively deficient strain of T.gondii, designated T-263. Bradyzoites in tissue cysts from laboratory animals infected with the mutant were fed to cats, which developed immunity against subsequent T.gondii challenge without concomitant shedding of infectious oocysts. The new vaccine eliminates the need for chemoprophylaxis subsequent to primary infection.

Vaccine for immunizing cats against toxoplasma oocyst shedding

A method for the immunization of mammals (including man) and birds, against Toxoplasma gondii is described which involves subcutaneous administration of a live, low-virulent vaccine comprising a temperature-sensitive mutant of the persistent, virulent RH strain of T. gondii. The vaccine gives immunity against subsequent challenge, but does not persist and does not cause chronic infection of the subject and which therefore cannot result in illness or death in the event that the subject later becomes immunosuppressed.

Growing community of inventors

Hanover, NH, United States of America

Elmer R Pfefferkorn