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Toxoplasma gondii: cross-immunity against the enteric cycle Freyre A; Falcon J; Mendez J; Gastell T; Venzal JMExp Parasitol 2007[Jan]; 115 (1): 48-52Eight of nine cats inoculated with strain ME-49 and challenged with three different strains of Toxoplasma were immune to oocyst shedding, as ascertained with bioassays of their feces. In a second experiment, only toxoplasma asexual stages were seen in H&E stained gut sections of cats treated with suppressive doses of sulfamerazine and pyrimethamine starting 2 days after oral inoculation with cysts of the strain ME-49 and killed 6 days later. In a third experiment, four cats were similarly inoculated and treated for 20 days. Six weeks later, the cats received an oral homologous challenge with cysts, and none shed toxoplasma oocysts. An acceptable level of cross-protection was achieved with strain ME-49, and therefore, it can be used as a candidate strain from which antigens could be tested for enteric protection.|Animals[MESH]|Biological Assay[MESH]|Cat Diseases/*immunology/parasitology[MESH]|Cats[MESH]|Cross Reactions[MESH]|Feces/parasitology[MESH]|Female[MESH]|Intestines/*immunology/parasitology[MESH]|Male[MESH]|Mice[MESH]|Toxoplasma/*immunology[MESH]|Toxoplasmosis, Animal/*immunology[MESH] |
