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Isolation of Toxoplasma from Salivary Glands and Saliva of Pigs with Asymptomatic Infections^*

Toxoplasma gondii was isolated from the salivary glands from 3 of 38 pigs having dye test titers of 1:16 or higher. Toxoplasmas were not isolated from the salivary glands of 53 pigs having dye test titers of less than 1:16.

The saliva from 8 naturally infected pigs and 6 experimentally infected pigs was inoculated into mice which neither became dye-test positive nor showed evidence of cysts of T. gondii in brain smears.

The pooled saliva from 4 experimentally infected pigs failed to produce infection when fed to a dye-test negative pig.

^* This investigation was supported by Public Health Service Grant CC 00077-04 from the National Institutes of Allergy and Infectious Diseases. A brief report was presented at the Annual Meeting of The American Society of Tropical Medicine and Hygiene, New York, New York (1964).