Prevalence of Cryptosporidium infection in dairy calves in western Washington

Ongerth, J.E.; Stibbs, H.H.

Prevalence of Cryptosporidium infection in dairy calves in western Washington

1989

Ongerth, J.E. | Stibbs, H.H.

The prevalence and intensity of Cryptosporidium infection were examined in 445 Holstein calves at 10 dairy farms in western Washington, near Seattle. Fifty-one percent (176) of calves in the 7- to 21-day-old age group (n = 342) were positive for oocysts in the feces by carbolfuchsin staining. Prevalence and intensity of infection were highest in calves 8 to 14 days old; prevalence was 60% in this group, and 48% of the Cryptosporidium-positive calves had oocyst shedding at a 4+ level. A seasonal pattern in prevalence was not evident.

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