Highly pathogenic avian influenza,
United States of America
Information received on 17/08/2015 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
Report type Follow-up report No. 25
Date of start of the event 10/12/2014
Date of confirmation of the event 15/12/2014
Report date 17/08/2015
Date submitted to OIE 17/08/2015
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)
Outbreaks There are no new outbreaks in this report
Source of the outbreak(s) or origin of infection
  • Contact with wild species
Epidemiological comments The following US States are no longer under any restriction and are free to move live poultry and poultry products domestically and internationally: Arkansas; California; Idaho; Indiana, Kansas; Missouri, Montana, North Dakota, Oregon, Washington, and Wisconsin. The USDA Animal and Plant Health Inspection Service (APHIS), in conjunction with State Departments of Agriculture and Wildlife, maintain a comprehensive epidemiological investigation and enhanced surveillance (including wild bird surveillance of hunter harvested birds) in response to the HPAI H5N8 and H5N2 wild bird related events. Novel avian influenza virus of Eurasian origin (EA-H5N8 clade 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 the US. In addition, overlap of the Pacific, Central, and Mississippi Americas flyways has resulted in movement of the virus to the central part of the country. The EA-H5 clade viruses are highly pathogenic for poultry. The last positive case of HPAI H5N2 was made on June 18, 2015. HPAI H5N2 events are now closed and resolved in the following states: Arkansas; California; Idaho; Indiana, Kansas; Missouri, Montana, North Dakota, Oregon, Washington, and Wisconsin. In addition to having no further HPAI events, these States (listed above) where controls have been released, have met the following: • Required surveillance in the state and control areas has been completed with negative results for HPAI. As a precaution, additional enhanced surveillance may continue in the state and area. • Depopulation of infected premises has been completed and appropriate disposal was completed • Cleaning and disinfection of the infected premises has been completed (including, but not limited to, outside areas of premises, equipment, trucks, and other fomites) • No recent HPAI detections through wild bird surveillance have been made. States that have not been released are making good progress and control areas in those states are being removed as they meet the time elements and other measures for release.
Control measures
Measures applied
  • Zoning
  • Stamping out
  • Quarantine
  • Disinfection / Disinfestation
  • Movement control inside the country
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • No other measures
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.