Information received on 22/07/2015 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
|Source of the outbreak(s) or origin of infection
Contact with wild species
||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 18.104.22.168) 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 United States. 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 22.214.171.124 viruses are highly pathogenic for poultry.
No new premises have been found positive for HPAI H5N2 since June 18, 2015. HPAI H5N2 events are now closed and all control areas have been released in the following states: Arkansas, California, Idaho, Indiana, Kansas, Missouri, Montana, North Dakota, Oregon, and Washington. 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 implemented or 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.
In addition, all affected 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.