LIFE-CYCLE OF ISOSPORA-BURROWSI N-SP (PROTOZOA-EIMERIIDAE) FROM DOG CANIS-FAMILIARIS

  • 1 January 1978
    • journal article
    • research article
    • Vol. 39  (1) , 95-98
Abstract
Exogenous and endogenous stages of I. burrowsi sp. nov. from the dog are described. Oocysts were spherical or ellipisoidal and 17-22 by 16-19 .mu.m (mean 20.3 by 17.3 .mu.m). Micropyle, oocyst residuum and polar granule were not present. Sporocysts were 12-16 by 8-11 .mu.m (mean 14.4 by 9.7 .mu.m). A Stieda body was absent, but a sporocyst residuum was present. Endogenous stages were in the caudal 3/5 of the small intestine and in the cecum. Mature 1st generation schizonts (11-18 by 9-18 .mu.m) were present on the 4th day of infection. One day later, mature 2nd generation schizonts (18-35 by 17-22 .mu.m) were present. Immature gamonts were found 5 days after infection, and unsporulated oocysts were also present later that day. The prepatent period was 6 days, and the mean patent period was 11 days. The oocysts of I. burrowsi differ markedly in size from all other Isospora spp. from dogs, except I. ohioensis; the endogenous stages of these 2 spp. differ.

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