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Related Experiment Videos

Latent bovine brucellosis

R D Lapraik, R Moffat

    The Veterinary Record
    |December 18, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Brucella abortus biotype 2 can persist asymptomatically in cattle for at least nine years. This study documents a heifer calf from an infected herd that later showed positive serological reactions and shed Brucella abortus biotype 2 in milk.

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    Area of Science:

    • Veterinary Science
    • Infectious Diseases
    • Bacteriology

    Background:

    • Brucella abortus causes brucellosis, a significant zoonotic disease affecting cattle worldwide.
    • Eradication campaigns often involve culling infected herds, but the long-term persistence of Brucella in individual animals requires further investigation.

    Purpose of the Study:

    • To investigate the long-term shedding and serological response of Brucella abortus biotype 2 in a cattle cohort.
    • To understand the potential for latent Brucella abortus infections to reactivate and be transmitted.

    Main Methods:

    • Serological testing of cattle for Brucella antibodies.
    • Bacteriological isolation of Brucella abortus from milk samples.
    • Case study tracking an individual animal from an infected herd.

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    Main Results:

    • Brucella abortus biotype 2 was isolated from an adult heifer nine years after initial exposure.
    • The infected heifer exhibited a strongly positive serological reaction.
    • The animal was initially moved from a herd undergoing eradication for Brucella abortus biotype 2.

    Conclusions:

    • Brucella abortus biotype 2 can remain latent in cattle for extended periods (at least nine years).
    • Latent infections can reactivate, leading to positive serological results and shedding in milk.
    • This highlights challenges in complete Brucella eradication programs.