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  • Title: Prevalence of Cryptosporidium infection in dairy calves in western Washington.
    Author: Ongerth JE, Stibbs HH.
    Journal: Am J Vet Res; 1989 Jul; 50(7):1069-70. PubMed ID: 2774326.
    Abstract:
    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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