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Bovine abortion caused by Bacillus cereus.

J Schuh, D Weinstock

    Journal of the American Veterinary Medical Association
    |November 15, 1985
    PubMed
    Summary

    Bacillus cereus infrequently causes bovine abortions, often missed due to lack of fetal lesions. A necrotizing toxin likely causes placentitis, leading to fetus expulsion before bacterial colonization.

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    Area of Science:

    • Veterinary Pathology
    • Bovine Reproductive Diseases
    • Microbial Pathogenesis

    Background:

    • Bacillus cereus is an uncommon cause of abortion in cattle.
    • Necrotizing placentitis is the primary observed pathology, with minimal fetal tissue lesions.
    • B. cereus is frequently misidentified as a contaminant in bovine abortion cases.

    Purpose of the Study:

    • To investigate the role of Bacillus cereus as an abortifacient agent in cattle.
    • To characterize the pathological findings associated with B. cereus-induced bovine abortions.
    • To highlight the diagnostic challenges in identifying B. cereus as a cause of bovine abortion.

    Main Methods:

    • Retrospective survey of bovine abortion pathology files.
    • Isolation and identification of Bacillus cereus from fetal tissues and placentas.
    • Pathological examination of aborted bovine fetuses and placentas.

    Main Results:

    • Eight out of 947 bovine abortions (0.84%) were attributed to B. cereus.
    • B. cereus was isolated in pure culture from affected fetuses and/or placentas.
    • Lesions were primarily confined to the placenta, with rare or absent fetal tissue lesions.

    Conclusions:

    • Bacillus cereus is an infrequent but significant cause of bovine abortion.
    • The failure to detect fetal lesions can lead to misdiagnosis, with B. cereus mistaken for contamination.
    • A necrotizing toxin produced by B. cereus is hypothesized to cause placentitis and subsequent fetal expulsion.

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