Abstract
A 2-month-old piglet was orally inoculated with 1.7×106 sporocysts of Sarcocystis miescheriana which had been collected form canine feces and stored at 4°C for about 1 month. In it, temperature rose rapidly to reach 41 to 42°C 11 days after inoculation. Pulse and respiratory rates increased and appetite was lost in the febrile stage. The piglet died 12 days after inoculation. A large number of petechiae were found in almost all the organs. The histopathological changes observed were hemorrhages and infiltration by mononuclear cells in the whole body. Schizonts were present in the small blood vessels of 24 of 30 kinds of tissues, being 16.7×9.3μm in average size. Japanese S. miescheriana was found to be highly pathogenic to swine.
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