Low pathogenic avian influenza (poultry) H7N7, United States of America (OIE, June 20 2013): 1 New Outbreak, Arkansas

[Giuseppe]

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


Low pathogenic avian influenza (poultry) H7N7, United States of America


Information received on 19/06/2013 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
  • Date of start of the event 06/06/2013
  • Date of pre-confirmation of the event 17/06/2013
  • Report date 19/06/2013
  • Date submitted to OIE 29/06/2013
  • Reason for notification Reoccurrence of a listed disease
  • Date of previous occurrence 01/08/2011
  • Manifestation of disease Clinical disease
  • Causal agent Low pathogenic avian influenza virus
  • Serotype H7N7
  • Nature of diagnosis Laboratory (advanced)
  • This event pertains to a defined zone within the country
• New outbreaks
  • Summary of outbreaks
    • Total outbreaks: 1
      • Outbreak Location - ARKANSAS ( Arkansas, Scott County )
        • Total animals affected: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
          • Birds - 9800 - ** - 0 - 9800 - 0
        • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
          • Birds - ** - 0.00% - ** - 100.00%
          • * 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
• Epidemiological comments
  • The USDA Animal Plant Health Inspection Service (APHIS) and the Arkansas Livestock & Poultry Commission are conducting a comprehensive epidemiological investigation of this event.
  • Testing of the flock was initiated after birds exhibited a drop in egg production of approximately ten percent.
  • Egg production was returning to normal and the birds appeared healthy at the time of inspection.
  • No increased mortality or respiratory signs were reported.
  • Note by the OIE Animal Health Information Department:
    • H5 and H7 avian influenza in its low pathogenic form in poultry is a notifiable disease as per Chapter 10.4. on avian influenza of the Terrestrial Animal Health Code (2012).
• Control measures
  • Measures applied
    • Stamping out
    • Quarantine
    • Movement control inside the country
    • Zoning
    • Vaccination prohibited
    • No treatment of affected animals
  • Measures to be applied
    • Disinfection of infected premises/establishment(s)
• Diagnostic test results
  • Laboratory name and type: Arkansas Livestock & Poultry Commission Laboratory ( Local laboratory )
    • Tests and results: Species - Test - Test date - Result
      • Birds - real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) - 17/06/2013 - Positive
  • Laboratory name and type: National Veterinary Services Laboratories (NVSL) ( National laboratory )
    • Tests and results: Species - Test - Test date - Result
      • Birds - agar-gel precipitation (AGP) test - 18/06/2013 - Positive
      • Birds - haemagglutination inhibition test (HIT) - 18/06/2013 - Positive
      • Birds - neuraminidase inhibition assay - 18/06/2013 - Positive
      • Birds - real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) - 18/06/2013 - Positive
      • Birds - virus isolation ? Pending
• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

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