Low pathogenic avian influenza (poultry),
United States of America
Information received on 10/03/2017 from Dr John Clifford, Official Delegate, Chief Trade Advisor, Animal and Plant Health Inspection Service, United States Department of Agriculture, Washington, United States of America
Report type Immediate notification
Date of start of the event 06/03/2017
Date of confirmation of the event 08/03/2017
Report date 10/03/2017
Date submitted to OIE 10/03/2017
Date event resolved 01/06/2017
Reason for notification Recurrence of a listed disease
Date of previous occurrence 2017
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
Related reports Immediate notification (10/03/2017)
Follow-up report No. 1 (24/03/2017)
Follow-up report No. 2 (03/04/2017)
Follow-up report No. 3 (25/04/2017)
Follow-up report No. 4 (05/05/2017)
Follow-up report No. 5 (22/05/2017)
Follow-up report No. 6 (05/06/2017)
New outbreaks (1)
Outbreak 1 Giles County, Giles, Tennessee
Date of start of the outbreak 06/03/2017
Outbreak status Resolved (10/04/2017)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 16500 0 16500 0
Affected population Commercial grandparent stock primary broiler breeder flock.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 16500 ** 0 16500 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
Source of the outbreak(s) or origin of infection
  • Unknown or inconclusive
Epidemiological comments As part of routine, pre-slaughter testing and surveillance for H5/H7 Avian Influenza, low pathogenic avian influenza (LPAI) H7N9 of North American wild bird lineage was detected in healthy broiler breeder chickens. This is the first detection of H7N9 LPAI poultry in TN and also the first detection of LPAI H7N9 in commercial poultry in the United States in 2017. Although this is a low pathogenicity H7 strain, as a precautionary preventive measure, the flock was depopulated. The USDA Animal Plant Health Inspection Service (APHIS) and the Tennessee Department of Agriculture are conducting a comprehensive epidemiological investigation and have implemented enhanced surveillance and testing related to this event.
Control measures
Measures applied
  • Movement control inside the country
  • Quarantine
  • Surveillance outside containment and/or protection zone
  • Stamping out
  • Official disposal of carcasses, by-products and waste
  • Surveillance within containment and/or protection zone
  • Zoning
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • Disinfection
Diagnostic test results
Laboratory name and type Species Test Test date Result
National Veterinary Services Laboratories (NVSL) (National laboratory) Birds virus isolation Pending
National Veterinary Services Laboratories (NVSL) (National laboratory) Birds virus sequencing 08/03/2017 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations