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KMID : 0359319950350010107
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Korean Journal of Veterinary Research
1995 Volume.35 No. 1 p.107 ~ p.113
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Experimental cryptosporidiosis in calves
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최상호/Choi, Sang Ho
박용호/이정길/강영배/주이석/위성환/주후돈/Park, Yong Ho/Lee, Chung Gil/Kang, Yung Bai/Joo, Yi Seok/Wee, Sung Hwan/Joo, Hoo Don
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Abstract
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Four Holstein calves 7-day-old were infected with C parvum oocysts for parasitological and pathological investigations of bovine cryptosporidiosis. Of those calf 1 was orally administered with 7×10^6 oocysts of C parvum isolated from a Korean mouse (VRI-CN91), and calf 2 with same number of C parvum oocysts provided by Washington State University (WSU). The rest (calf 3 and 4) were orally administered with 1×10^8 oocysts of VRI-CN91 strain. Calf 1 commenced to discharge oocysts in feces at days 6 post inoculation (PI), and it reached a peak 1.4×10^7 oocysts per gram of feces (OPG) on day 8 PI. Calf 2 commenced to discharge oocysts in feces at day 4 PI, and it reached a peak 3.75×10^6 OPG on day 7 PI. Calf 3 and 4 commenced to discharge oocysts in feces at day 3 and day 4 PI, and it reached a peak on day 7 PI (calf 3, 7.8×10^6 OPG; calf 4, 1.7×10^6 OPG).
Clinically, the calves began to show mucoid-watery diarrhea at day 3 to 5 PI, and the sign lasted 5 to 7 days. Calf 2 died on day 9 PI with a severe dehydration. On necropsy the intestine was found to be congested and hemorrhagic. Protozoan oocysts were observed mainly in the ileum and occasionally in jejunum. The results in the present study indicate that the Korean isolate was pathogenic in calves.
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