Low pathogenic avian influenza (poultry),
United States of America
Information received on 06/03/2018 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
Summary
Report type Immediate notification
Date of start of the event 26/02/2018
Date of confirmation of the event 03/03/2018
Report date 06/03/2018
Date submitted to OIE 06/03/2018
Date event resolved 30/04/2018
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 H7N1
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (06/03/2018)
Follow-up report No. 1 (23/03/2018)
Follow-up report No. 2 (23/05/2018)
New outbreaks (1)
Outbreak 1 Jasper County, Jasper, Missouri
Date of start of the outbreak 26/02/2018
Outbreak status Resolved (30/04/2018)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 20000 0 0 20000
Affected population Commercial meat turkey flock
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 20000 ** 0 0 20000
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 As part of routine, pre-slaughter testing and surveillance for H5/H7 Avian Influenza, H7N1 presumptive low pathogenic avian influenza (LPAI) was detected in a healthy commercial meat turkey flock based upon H7 PCR and antibody to H7 and N1; further characterization is pending virus recovery. There have been no clinical signs of illness or increased mortality on the premises. This is the first detection of H7 LPAI in commercial poultry in the United States for 2018. The turkeys will be depopulated through controlled marketing. The USDA Animal Plant Health Inspection Service (APHIS) and the Missouri Department of Agriculture are conducting a comprehensive epidemiological investigation and have implemented enhanced surveillance and testing related to this finding. Two additional commercial poultry premises located within the 10km zone were tested negative for influenza virus.
Control measures
Measures applied
  • Movement control inside the country
  • Surveillance outside containment and/or protection zone
  • Surveillance within containment and/or protection zone
  • Quarantine
  • Zoning
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • No other measures
Diagnostic test results
Laboratory name and type Species Test Test date Result
Missouri Department of Agriculture Veterinary Diagnostic Laboratory (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 02/03/2018 Positive
National Veterinary Services Laboratories (National laboratory) Birds haemagglutination inhibition test (HIT) 05/03/2018 Positive
National Veterinary Services Laboratories (National laboratory) Birds neuraminidase inhibition assay 05/03/2018 Positive
National Veterinary Services Laboratories (National laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 03/03/2018 Positive
National Veterinary Services Laboratories (National laboratory) Birds virus isolation Pending
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations