Highly pathogenic influenza A viruses (infection with) (non-poultry including wild birds),
United States of America
Information received on 10/01/2017 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 27/12/2016
Date of confirmation of the event 09/01/2017
Report date 09/01/2017
Date submitted to OIE 10/01/2017
Date event resolved 27/03/2017
Reason for notification Recurrence of a listed disease
Date of previous occurrence 10/11/2016
Manifestation of disease Sub-clinical infection
Causal agent Highly pathogenic influenza A virus
Serotype H5N2
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (09/01/2017)
Follow-up report No. 1 (29/03/2017)
New outbreaks (1)
Outbreak 1 Fergus County, Fergus, Montana
Date of start of the outbreak 27/12/2016
Outbreak status Resolved (27/03/2017)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Mallard:Anas platyrhynchos(Anatidae)
Affected population Wild mallard duck
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Mallard:Anas platyrhynchos(Anatidae) **
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Mallard:Anas platyrhynchos(Anatidae) ** ** ** **
*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
  • Contact with wild species
Epidemiological comments The sample, from a wild mallard duck, was collected on 27 December 2016 as part of the hunter harvested wild bird avian influenza surveillance program. Genome sequencing results show that the Montana isolate is an Eurasian/American (EA/AM) H5N2 HPAI strain. The partial genome fragments that have been analyzed thus far are >99% similar to the virus isolated from a northern pintail duck in Washington State in December 2014. The H5N2 outbreak viruses from 2015 were all >99% similar to the northern pintail index case (A/Northern pintail/Washington/40964/2014 H5N2). Efforts to obtain sequence data for the full genome are underway. This detection of HPAI (EA/AM) H5N2 virus in a wild bird is NOT associated with any commercial poultry in the United States.
Control measures
Measures applied
  • 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
National Veterinary Services (National laboratory) Mallard gene sequencing 09/01/2017 Positive
National Veterinary Services (National laboratory) Mallard real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 05/01/2017 Positive
National Veterinary Services (National laboratory) Mallard virus isolation Pending
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations