Abstract
Ayoung cow was inoculated orally with 2.7×106sporocysts ofSarcocystis cruziwhich had been collected from canine feces and stored at 4°C for about 18 months. A peak of fever was observed 15 and 26 days after inoculation. Pulse and respiratory rates increased and appetite was lost in the second febrile stage.The cow was killed for examination 29 days after inoculation. A large number of petechiae were found in almost all its organs. Merozoites were detected in the physiological saline suspensions of lung, thymus, liver, mesenteric lymph nodes and adrenal gland each. Histologically, schizonts were observed in the cerebellum, lung, hilar lymph node, thymus, rumen, abomasum, small intestine, rectum, liver, kidney, adrenal gland, uterus and heart. They were7 to 25 by 5 to 17.5μm in size, averaging 14.9 by 9.3μm (N=44).Sarcocystis cruziwasfound to be highly pathogenic to cattle also in Japan.
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