Highly pathogenic avian influenza,
United States of America
Information received on 22/01/2015 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 Follow-up report No. 3
Date of start of the event 10/12/2014
Date of confirmation of the event 15/12/2014
Report date 22/01/2015
Date submitted to OIE 22/01/2015
Date event resolved 13/11/2015
Reason for notification Recurrence of a listed disease
Date of previous occurrence 2004
Manifestation of disease Clinical disease
Causal agent Highly pathogenic avian influenza virus
Serotype H5N2
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (16/12/2014)
Follow-up report No. 1 (07/01/2015)
Follow-up report No. 2 (13/01/2015)
Follow-up report No. 3 (22/01/2015)
Follow-up report No. 4 (03/02/2015)
Follow-up report No. 5 (17/02/2015)
Follow-up report No. 6 (24/02/2015)
Follow-up report No. 7 (06/03/2015)
Follow-up report No. 8 (12/03/2015)
Follow-up report No. 9 (20/03/2015)
Follow-up report No. 10 (31/03/2015)
Follow-up report No. 11 (08/04/2015)
Follow-up report No. 12 (15/04/2015)
Follow-up report No. 13 (24/04/2015)
Follow-up report No. 14 (01/05/2015)
Follow-up report No. 15 (08/05/2015)
Follow-up report No. 16 (20/05/2015)
Follow-up report No. 17 (29/05/2015)
Follow-up report No. 18 (09/06/2015)
Follow-up report No. 19 (17/06/2015)
Follow-up report No. 20 (26/06/2015)
Follow-up report No. 21 (02/07/2015)
Follow-up report No. 22 (22/07/2015)
Follow-up report No. 23 (31/07/2015)
Follow-up report No. 24 (10/08/2015)
Follow-up report No. 25 (17/08/2015)
Follow-up report No. 26 (24/08/2015)
Follow-up report No. 27 (01/09/2015)
Follow-up report No. 28 (08/09/2015)
Follow-up report No. 29 (14/09/2015)
Follow-up report No. 30 (21/09/2015)
Follow-up report No. 31 (07/10/2015)
Follow-up report No. 32 (13/10/2015)
Follow-up report No. 33 (13/11/2015)
Follow-up report No. 34 (18/11/2015)
New outbreaks (3)
Outbreak 1 ( 5) Canyon County, Canyon, IDAHO
Date of start of the outbreak 07/01/2015
Outbreak status Resolved (10/02/2015)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 31 5 5 26 0
Affected population The affected premises was a small backyard poultry flock of chickens and two ducks which were periodically allowed to range freely.
Outbreak 2 ( 6) Clallam County, Clallam, WASHINGTON
Date of start of the outbreak 08/01/2015
Outbreak status Resolved (10/02/2015)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 100 3 3 97 0
Affected population The affected premises was a small mixed free-range backyard flock of geese, ducks, and chickens that were allowed access to the outdoors and regularly exposed to wild migratory waterfowl.
Outbreak 3 ( 4) Lane County, Lane, OREGON
Date of start of the outbreak 12/01/2015
Outbreak status Resolved (12/04/2015)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Mallard:Anas platyrhynchos(Anatidae)
Affected population Hunter harvested wild mallard duck.
Summary of outbreaks Total outbreaks: 3
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 131 8 8 123 0
Mallard:Anas platyrhynchos(Anatidae) **
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds 6.11% 6.11% 100.00% 100.00%
Mallard:Anas platyrhynchos(Anatidae) ** ** ** **
*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
  • Contact with wild species
Epidemiological comments The USDA Animal and Plant Health Inspection Service (APHIS), in conjunction with State Departments of Agriculture and Wildlife, are continuing to conduct a comprehensive epidemiological investigation and enhanced surveillance (including wild bird surveillance of hunter harvested birds) in response to the HPAI H5N2 wild bird related event. All backyard premises have been quarantined and enhanced active surveillance is being initiated in and around the backyard flocks Novel avian influenza virus of Eurasian origin (EA-H5N8 clade 2.3.4.4) spread rapidly along wild bird migratory pathways during 2014. Introduction of this EA-H5N8 virus into the Pacific Flyway sometime during 2014 has allowed mixing with North American (AM) lineage viruses and generated new combinations with genes from both EA and AM origin (or “reassortant” viruses) such as this EA/AM H5N2-reassortant detected in Canada and the US. These findings are not unexpected as the EA-H5N8 virus continues to circulate. The EA-H5 clade 2.3.4.4 viruses are highly pathogenic for poultry. The HPAI EA/AM H5N2-reassortant virus has NOT been found in commercial poultry anywhere in the United States.
Control measures
Measures applied
  • Movement control inside the country
  • Disinfection / Disinfestation
  • Quarantine
  • Stamping out
  • 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 Laboratories (NVSL) (National laboratory) Mallard real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 12/01/2015 Positive
National Veterinary Services Laboratories (NVSL) (National laboratory) Mallard virus sequencing 12/01/2015 Positive
National Veterinary Services Laboratory (NVSL) (National laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 16/01/2015 Positive
National Veterinary Services Laboratory (NVSL) (National laboratory) Birds virus sequencing 16/01/2015 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations