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30. Cryptosporidium: different behaviour in calves of isolates of human origin.

Author

Pozio E, Gomez Morales MA, Barbieri FM, and La Rosa G

Subjects
Animals, Cattle, Cryptosporidiosis transmission, Diarrhea parasitology, Diarrhea veterinary, Humans, Parasite Egg Count, Time Factors, Zoonoses, AIDS-Related Opportunistic Infections parasitology, Cattle Diseases parasitology, Cryptosporidiosis parasitology, Cryptosporidium parvum pathogenicity
Abstract

The behaviour in calves of 3 Cryptosporidium human isolates was analysed in comparison with a bovine isolate. Twenty-four neonatal calves were infected. An isolate from a patient infected with human immunodeficiency virus (HIV) and showing mild cryptosporidiosis caused severe diarrhoea with a high production of oocysts in neonatal calves, as did a bovine isolate (group 1). Two human isolates, obtained from HIV patients with severe cryptosporidiosis, caused mild diarrhoea with low oocyst production in neonatal calves (group 2). The difference between the 2 groups in numbers of oocysts shed in calves was statistically significant (P = 0.005), as was the duration of oocyst shedding (P = 0.0004). Oocysts of group 2 isolates were less resistant to storage in 2% potassium dichromate at 4 degrees C than were oocysts of group 1. The biological and epidemiological implications are discussed.

Published
1992
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