Highly pathogenic avian influenza,
United States of America
Information received on 19/12/2014 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 Follow-up report No. 1
Date of start of the event 10/12/2014
Date of confirmation of the event 14/12/2014
Report date 19/12/2014
Date submitted to OIE 19/12/2014
Date event resolved 22/07/2015
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 H5N8
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 (19/12/2014)
Follow-up report No. 2 (29/12/2014)
Follow-up report No. 3 (07/01/2015)
Follow-up report No. 4 (22/01/2015)
Follow-up report No. 5 (25/01/2015)
Follow-up report No. 6 (03/02/2015)
Follow-up report No. 7 (13/02/2015)
Follow-up report No. 8 (25/02/2015)
Follow-up report No. 9 (05/03/2015)
Follow-up report No. 10 (20/03/2015)
Follow-up report No. 11 (31/03/2015)
Follow-up report No. 12 (22/04/2015)
Follow-up report No. 13 (21/05/2015)
Follow-up report No. 14 (09/06/2015)
Follow-up report No. 15 (16/06/2015)
Follow-up report No. 16 (22/07/2015)
Follow-up report No. 17 (17/08/2015)
New outbreaks (1)
Outbreak 1 Douglas County, Douglas, Oregon
Date of start of the outbreak 16/12/2014
Outbreak status Resolved (26/03/2015)
Epidemiological unit Backyard
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 130 28 28 102 0
Affected population The affected premises was a small backyard mixed flock of guinea fowl, chickens, ducks, and geese that were allowed access to the outdoors and regularly exposed to wild migratory waterfowl.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Birds 130 28 28 102 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds 21.54% 21.54% 100.00% 100.00%
*Removed from the susceptible population through death, destruction and/or slaughter
Source of the outbreak(s) or origin of infection
  • Contact with wild species
Epidemiological comments The USDA Animal and Plant Health Inspection Services (APHIS) and the Oregon Department of Agriculture (ODA) are conducting a comprehensive investigation of this outbreak. The USDA APHIS National Veterinary Services Laboratory (NVSL) confirmed avian influenza virus (AIV) H5N8 via sequencing directly from swab samples. Preliminary results indicate the HA sequence is 99.3% similar to A/bean goose/Korea/H40/2014 (H5N8 HPAI) based on a partial fragment of the HA gene. The neuraminidase sequence is 99.7% similar to A/Baikal teal/Korea/H80/2014 (H5N8) based on a partial fragment of the NA gene. The amino acid sequence at the hemagglutinin cleavage site is consistent with highly pathogenic avian influenza (HPAI). Whole genome sequencing is in progress. Enhanced surveillance by the USDA APHIS and ODA is being initiated. The H5N8 highly pathogenic avian influenza (HPAI) in Oregon is limited to a small backyard poultry premises only and does not involve commercial poultry.
Control measures
Measures applied
  • Quarantine
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • Disinfection / Disinfestation
  • Stamping out
Diagnostic test results
Laboratory name and type Species Test Test date Result
National Veterinary Services Laboratories (National laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 18/12/2014 Positive
National Veterinary Services Laboratories (National laboratory) Birds virus sequencing 18/12/2014 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations