United States - 1 new outbreak of highly pathogenic avian influenza H5N2 in birds (OIE, June 26, 2015)

[Pathfinder]

Highly pathogenic avian influenza, United States of America

Information received on 26/06/2015 from Dr John Clifford, Deputy Administrator, Animal and Plant Health Inspection Service, United States Department of Agriculture, Washington, United States of America

Summary Report type Follow-up report No. 20 Date of start of the event 10/12/2014 Date of confirmation of the event 15/12/2014 Report date 26/06/2015 Date submitted to OIE 26/06/2015 Reason for notification Reoccurrence 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)

New outbreaks (1)

Outbreak 1 (241) Wright County 6, Wright, IOWA Date of start of the outbreak 17/06/2015 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Destroyed Slaughtered Birds 1000000 1000000 Affected population A commercial chicken layer flock.

Summary of outbreaks Total outbreaks: 1 Total animals affected Species Susceptible Cases Deaths Destroyed Slaughtered Birds 1000000 ** 1000000 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Birds ** ** ** ** *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, 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 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 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 2.3.4.4 viruses are highly pathogenic for poultry. Some HPAI events are now closed and control areas have been released in the following States: Arkansas; California; Idaho; Kansas; Oregon; and Washington. These States have not had any recent HPAI events and have demonstrated: ? 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.

Control measures Measures applied Stamping out Quarantine Movement control inside the country Zoning Disinfection / Disinfestation 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) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 17/06/2015 Positive National Veterinary Services Laboratories (NVSL) (National laboratory) Birds virus sequencing 17/06/2015 Positive

Future Reporting The event is continuing. Weekly follow-up reports will be submitted.

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