日本における Hammondia hammondiの分離

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  • Isolation of Hammondia hammondi in Japan.
  • 日本におけるHammondia hammondiの分離〔英文〕
  • ニホン ニ オケル Hammondia hammondi ノ ブンリ エイブン

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A cat which was fed muscles of a goat shed Toxoplasma-like oocysts (G-8 isolate) 43 days after feeding. The oocysts were subspherical to ovoid, measuring 12.7×11.5μm (unsporulated oocysts) and 13.0×11.4μm (sporulated oocysts). When mice were inoculated orally with 105 oocysts, tachyzoites were observed in the kidney, lung, mesenteric lymph nodes, small intestine and spleen of the mice 1 to 15 days after infection. Cysts were seen in the brain and various muscles. Cysts measured 25-224×2-80μm in the skeletal muscle and 35×35μm in the brain 181 days after infection. Bradyzoites in mice were not infectious to other mice. Sometimes antibody to Toxoplasma was observed in the mouse sera but the titer was low. Cats fed bradyzoites began to discharge oocysts from 7 to 8 days after ingestion. But cats inoculated with 106 oocysts of G-8 isolate shed no oocysts within 60 days after inoculation, and cats fed the muscles of these oocyst-inoculated cats shed no oocysts. The life cycle of G-8 isolate was obligatorily heteroxenous, and cysts in the muscles of the infected mice morpholoigcally resembled those of Hammondia hammondi (Frenkel and Dubey 1975). G-8 isolate was identified to be H. hammondi.

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