2009 pandemic A/H1N1 influenza virus, United States of America (WAHID Interface - OIE World Animal Health Information Database, 12/1/09, edited)

[Giuseppe]

2009 pandemic A/H1N1 influenza virus, United States of America (WAHID Interface - OIE World Animal Health Information Database, 12/1/09, edited)

2009 pandemic A/H1N1 influenza virus, United States of America

Information received on 30/11/2009 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 16/11/2009
  • Date of first confirmation of the event 24/11/2009
  • Report date 30/11/2009
  • Date submitted to OIE 30/11/2009
  • Reason for notification Emerging disease
  • Morbidity 1 scale05
  • Mortality 0 scale05
  • Zoonotic impact Refer to OIE guidance/opinion
  • Causal agent 2009 pandemic A/H1N1 influenza virus

• New outbreaks
  • Outbreak 1 - State of Virginia, VIRGINIA
    • Date of start of the outbreak 16/11/2009
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
      • Birds - 3270 - 0 - 0 - 0
      • Affected Population - Commercial turkey breeder flock.
        • The barn housing the affected birds contains approximately 3,270 turkey breeder hens.
        • No other barns on the farm are reported to be affected and no other birds have shown signs of clinical illness.

• Summary of outbreaks
  • Total outbreaks: 1
  • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
    • Birds - ** - 0.00% - ** - 0.00%
    • * 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 Virginia Department of Agriculture and Consumer Services are conducting a comprehensive epidemiological investigation of this event.
  • Epidemiological sequence of event as of 30 November 2009:
    • Week of 16 November 2009: A significant drop in egg production was observed in one barn only.
    • 23 November 2009: Presumptive detection of 2009 pandemic A/H1N1 was reported to APHIS and laboratory samples were submitted to the National Veterinary Services Laboratories (NVSL).
    • 30 November 2009: NVSL confirmation of 2009 pandemic A/H1N1 influenza virus.
    • Information points to recent exposure of the turkeys to a farm worker exhibiting influenza-like symptoms.
    • The farm was/and continues to be under enhanced biosecurity.

• Control measures
  • Measures applied
    • No vaccination
    • No treatment of affected animals
  • Measures to be applied
    • No other measures

• Diagnostic test results
  • Laboratory name and type National Veterinary Services Laboratory (NVSL) (National laboratory)
    • Tests and results: Species - Test - Test date - Result
      • Birds - agar-gel immunodiffusion (AGID) - 24/11/2009 - Positive
      • Birds - gene sequencing - 30/11/2009 - Positive
      • Birds - real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) - 24/11/2009 - Positive
      • Birds - virus isolation - 30/11/2009 - Positive

• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

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<cite cite="http://www.oie.int/wahis/public.php?page=single_report&pop=1&reportid=8709" >WAHID Interface - OIE World Animal Health Information Database</cite>