Transmission ofSarcocystis suihominis from humans to swine to nonhuman primates (Pan troglodytes, Macaca mulatta, Macaca irus)

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Abstract
Sporocysts ofSarcocystis suihominis obtained from human feces were used to infect swine. Heart, tongue, and skeletal muscle from experimentally infected and noninfected control swine were fed via stomach tube to nonhuman primates including chimpanzees (Pan troglodytes), rhesus monkeys (Macaca mulatta), and cynomolgus monkeys (Macaca irus). All primates fed infected swine tissues shed sporocysts beginning 13 to 15 days postinfection and were still shedding sporocysts at the conclusion of the experiment, 30 days postinfection. Rhesus and cynomolgus monkeys were fed infected swine tissues a second time and shed sporocysts. All primates remained in good health throughout both experiments and exhibited no unusual clinical signs as a result of infection.