Abstract
Four adult cats (two testing positive and two negative for feline leukemia virus FeLV) were fed Toxoplasma gondii tissue cysts collected from the brains of mice. Two control cats (1 FeLV+, 1 FeLV-) were not fed cysts. The cats infected with T. gondii shed thousands of oocysts but remained clinically and physically normal, with hemograms and clinical chemistry values essentially unchanged irrespective of their FeLV status. Infection with FeLV did not increase the duration of oocyst shedding. At necropsy no significant lesions were found. T. gondii antibodies were detected by three serologic tests in the cats fed tissue cysts. The time necessary for an antibody response to T. gondii was not altered by the FeLV infection. Indirect hemagglutination (IHA) was the least reliable of the serologic tests studied; it detected antibodies later in the infection, and titers were less than in the other tests. Latex agglutination (LA) detected antibodies a few days before IHA, but titers were less than in modified direct agglutination (MAT). MAT detected antibodies earliest in the infection and also measured antibodies in aqueous humor and cerebrospinal fluid.
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