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

Information received on 06/08/2009 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 26/07/2009
Date of first confirmation of the event 04/08/2009
Report date 06/08/2009
Date submitted to OIE 06/08/2009
Reason for notification Reoccurrence of a listed disease
Date of previous occurrence 07/2009
Manifestation of disease Sub-clinical infection
Causal agent Low pathogenic avian influenza virus
Serotype H7N9
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 and Affected population
  • MINNESOTA (Meeker County, Meeker) : A commercial turkey operation with an estimated 160,000 birds in 16 houses. The birds are 12 to 13 weeks old.
Total animals affected
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 160000 ** 0 0 0
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 Minnesota Board of Animal Health (BAH) placed a quarantine on the affected premises and implemented the H5/H7 LPAI State Response and Containment Plan.
- There are no signs of clinical illness or increased mortality in the flock
- Enhanced surveillance will be conducted on all flocks within a 5km (3 mile) radius and on all flocks epidemiologically linked to the affected premises.
-No virus has been isolated yet. Further laboratory testing is pending.

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 (2008).

Control measures

Measures applied
  • Quarantine
  • Zoning
  • Vaccination prohibited
  • 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 real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 04/08/2009 Positive

Future Reporting

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