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
Date event resolved 21/12/2009
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
Related reports

New outbreaks
Outbreak 1 State of Virginia, VIRGINIA
Date of start of the outbreak 16/11/2009
Outbreak status Resolved (21/12/2009)
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.

Map of outbreak locations
Location of current outbreaks

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