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Bovine spongiform encephalopathy, United States of America (OIE, April 26 2012): 1 New Case of Atypical BSE

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  • Bovine spongiform encephalopathy, United States of America (OIE, April 26 2012): 1 New Case of Atypical BSE

    [Source: OIE, full page: (LINK). Edited.]


    Bovine spongiform encephalopathy, United States of America


    Information received on 26/04/2012 from Dr John Clifford, Deputy Administrator, Animal and Plant Health Inspection Service, United States Department of Agriculture, Washington, United States of America
    • Summary
      • Report type Immediate notification
      • Start date 19/04/2012
      • Date of first confirmation of the event 23/04/2012
      • Report date 26/04/2012
      • Date submitted to OIE 26/04/2012
      • Reason for notification Reoccurrence of a listed disease
      • Date of previous occurrence 2006
      • Manifestation of disease Sub-clinical infection
      • Causal agent Prion (atypical BSE)
      • Nature of diagnosis Laboratory (advanced)
      • This event pertains to the whole country
    • New outbreaks
      • Outbreak 1 - Tulare, County, Tulare, County, CALIFORNIA
        • Date of start of the outbreak 19/04/2012
        • Outbreak status Continuing (or date resolved not provided)
        • Epidemiological unit Farm
        • Affected animals: Species – Susceptible – Cases – Deaths – Destroyed – Slaughtered
          • Cattle - … – 1 - … – 1 – 0
          • Affected Population:
            • As part of a targeted BSE surveillance at rendering facilities, a deceased dairy cow (10 years and seven months old) was tested for BSE.
    • Summary of outbreaks
      • Total outbreaks: 1
      • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
        • Cattle – ** – ** – ** - **
        • * Removed from the susceptible population through death, destruction and/or slaughter
        • ** Not calculated because of missing information
    • Epidemiology
      • Source of the outbreak(s) or origin of infection
        • Unknown or inconclusive
        • Random mutation
    • Epidemiological comments
      • As part of the United States targeted bovine spongiform encephalopathy (BSE) surveillance system a case of BSE classified as atypical was identified in a dead dairy cow that was to be rendered. The dead animal’s carcass will be destroyed.
        • The cow was culled due to lameness.
        • The identified animal was never presented for slaughter for human consumption, did not enter food supply channels, and at no time presented any risk to human health.
        • An epidemiological investigation into the incident has been initiated.
        • Movement controls have been placed on the index premises.
    • Control measures
      • Measures applied
        • Quarantine
        • Screening
        • No vaccination
        • No treatment of affected animals
      • Measures to be applied
        • No other measures
    • Diagnostic test results
      • Laboratory name and type University of California (Local laboratory)
        • Tests and results: Species – Test - Test date – Result
          • Cattle - enzyme-linked immunosorbent assay (ELISA) - 19/04/2012 - Doubtful (uncertain)
      • Laboratory name and type National Veterinary Services Laboratories (NVSL) (National laboratory)
        • Tests and results: Species – Test - Test date – Result
          • Cattle - enzyme-linked immunosorbent assay (ELISA) - 21/04/2012 - Doubtful (uncertain)
          • Cattle - immunohistochemical test - 23/04/2012 – Positive
          • Cattle - western blotting - 23/04/2012 – Positive
    • Future Reporting
      • The event is continuing. Weekly follow-up reports will be submitted.
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