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  • Title: Congenital spirochetosis in calves: association with epizootic bovine abortion.
    Author: Osebold JW, Spezialetti R, Jennings MB, Pritchett RF, Bushnell RB.
    Journal: J Am Vet Med Assoc; 1986 Feb 15; 188(4):371-6. PubMed ID: 3949612.
    Abstract:
    Congenital spirochetosis was encountered as a newly recognized infection of cattle. The spirochete was seen in blood of fetuses with lesions of epizootic bovine abortion. A spirochete with morphologic features similar to those found in the fetuses was detected in Ornithodoros coriaceus ticks. Ticks collected from rangelands were allowed to feed on cows that then produced epizootic bovine abortion-affected fetuses, and the fetuses had spirochetosis. Inapparent spirochetosis also was found in fetuses in clinically normal cattle sent to slaughter. Only a few lesions were seen in abattoir-collected fetuses. Fetal spirochetosis was common in the bovine population studied, and it appeared that infection may be limited only by the availability of the tick vector.
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