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Related Experiment Videos

[Serratia-mastitis in cows as a herd problem].

A Isaksson, O Holmberg

    Nordisk Veterinaermedicin
    |November 1, 1984
    PubMed
    Summary

    A severe Serratia marcescens outbreak caused widespread mastitis in a Swedish dairy herd, leading to significant cow losses despite various treatments. Sawdust litter and milking machines were suspected transmission routes for this unusual bacterial infection.

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    Area of Science:

    • Veterinary Medicine
    • Bacteriology
    • Animal Health

    Context:

    • A dairy herd in Sweden experienced an unprecedented outbreak of clinical mastitis.
    • The infection was caused by Serratia marcescens, a bacterium not commonly associated with such severe mastitis cases.

    Purpose:

    • To investigate the scale, characteristics, and potential sources of a widespread Serratia marcescens mastitis outbreak in a dairy herd.
    • To evaluate the effectiveness of standard mastitis control measures against this specific pathogen.

    Summary:

    • The outbreak affected nearly all cows, with a high incidence of mild, short-duration mastitis cases over an extended period.
    • Serratia marcescens was consistently isolated from affected cows, though the strains showed no unusual laboratory characteristics.
    • Standard treatments including antibiotics, dry cow therapy, and teat dipping were ineffective.

    Impact:

    • The outbreak resulted in a drastic reduction in the herd size, with 23 out of 37 cows culled over 21 months.
    • Contaminated sawdust litter and milking machine contamination during milking were identified as probable sources of infection.
    • The study suggests a potential increase in Serratia marcescens pathogenicity or cow susceptibility during this event.

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