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Am. J. Trop. Med. Hyg., 31(2), 1982, pp. 226-229
Copyright © 1982 by The American Society of Tropical Medicine and Hygiene

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Cryptosporidiosis of Man and Calf: a Case Report and Results of Experimental Infections in Mice and Rats*

Norman C. Reese, William L. Current, John V. Ernst AND W. S. Bailey
Department of Zoology—Entomology, Auburn University, Alabama 36849 and Regional Parasite Research Laboratory, USDA, ARS, Auburn, Alabama 36830

Cryptosporidiosis is reported in a healthy 25-year-old male. Clinical symptoms include 1 day of nausea and low-grade fever and 9 days of diarrhea, followed by 3 days of constipation. Oocysts of Cryptosporidium sp. were present in sugar flotations of the first fecal sample collected 56 hours after onset of the symptoms and in daily fecal samples collected through day 12 of the illness. Oocysts of the human isolate of Cryptosporidium sp. were morphologically indistinguishable from those obtained from naturally and experimentally infected calves. After 1 week of sporulation at room temperature, oocysts from the human and from calves contained four sporozoites and a spherical residuum. When inoculated orally, sporulated Cryptosporidium sp. oocysts of human and of calf origin produced indistinguishable infections in suckling mice and rats and in adult mice.

Accepted for publication September 29, 1981.


* This study was supported in part by General Cooperative Agreement No. 58-7B30-1-265, Alabama Agricultural Experiment Station and USDA, AR.

Address reprint requests to W. L. Current, 101 Cary Hall, Auburn University, AL 36849.




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W. Current and T. Haynes
Complete development of Cryptosporidium in cell culture
Science, May 11, 1984; 224(4649): 603 - 605.
[Abstract] [PDF]


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Copyright © 1982 by the American Society of Tropical Medicine and Hygiene.