Salmonella dublin in Danish dairy herds: Frequency of change to positive serological status in bulk tank milk ELISA in relation to serostatus of neighbouring farms

A. Wedderkopp, U. Strøger, Peter Lind

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Bulk tank milk from 1,429 herds were collected in 3 rounds from 19 different geographic areas. The milk samples were tested by use of indirect LPS-ELISA procedure to detect Salmonella dublin antibodies. From the obtained OD-values herd seroprevalence in the given area was determined and GR-scores calculated for each herd by addition of the number of positive sampling rounds by the 5 geographically closest neighbour herds. In the 19 different areas the calculated prevalence ranged from 0.01 to 0.41. Totally 3,697 GR-scores were given. The mean GR-scores in the areas ranged from 0.0 to 6.5. Higher GR-scores were found in herds changing to seropositive status compared with herds seronegative throughout the study period. The results indicate that the risk for a dairy herd to receive S. dublin infection increases with the disease status among the nearest neighbours and with the prevalence of seropositive herds in the geographic area.
    Original languageEnglish
    JournalActa Veterinaria Scandinavica (Print Edition)
    Volume42
    Issue number2
    Pages (from-to)295-301
    ISSN0044-605X
    Publication statusPublished - 2001

    Keywords

    • risk
    • LPS-ELISA
    • dairy herds
    • epidemiology
    • milk samples
    • cattle
    • Salmonella dublin
    • seroprevalence

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