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Event summary: Highly pathogenic avian influenza, United States of America
Start of event 10/12/2014
Confirmation 14/12/2014
Report date 16/12/2014
Submission date 16/12/2014
Reason Recurrence
This event pertains to a defined zone within the country
Number of outbreaks 22
Date resolved 22/07/2015
Epidemiological comments As a precaution and in response to the recent HPAI outbreak in Canada, surveillance of poultry premises and of wild bird mortality events was enhanced by the USDA, and State personnel along the United States - Canadian Border. Through this surveillance, highly pathogenic avian influenza (HPAI) H5 was identified in wild birds. Two serotypes were identified on enhanced surveillance, both with amino acid sequence at the HA cleavage site consistent with HPAI, H5N8 and H5N2. H5N8 was identified in a captive wild gyrfalcon that was fed hunter killed wild birds from Whatcom County, Washington and H5N2 was identified in a wild pintail duck also from Whatcom County, Washington. Based upon direct sequencing from gyrfalcon specimens, an avian influenza subtype H5N8 of Eurasian lineage (partial H5 99% similarity to A/coot/Korea/H81/2014 and partial N8 99% similarity to A/Baikal teal/Korea/H41/2014). The amino acid sequence at the hemagglutinin cleavage site is consistent with highly pathogenic avian influenza (HPAI). Preliminary data suggests that these virus strains (H5N2 and H5N8) may be related with the H5N8 strain potentially representing the progenitor; however further analysis is needed. Neither of these viruses has been found in any poultry in the United States. These H5N8 and H5N2 detections involve only wild birds. Further investigation and characterization of the HPAI viruses is ongoing.
United States of America has submitted the following immediate notification and follow-up report (s) to OIE.

View Report Date Date submitted to OIE Report Type
Full report 16/12/2014 16/12/2014 Immediate notification
Full report 19/12/2014 19/12/2014 Follow-up Report 1
Full report 29/12/2014 29/12/2014 Follow-up Report 2
Full report 07/01/2015 07/01/2015 Follow-up Report 3
Full report 22/01/2015 22/01/2015 Follow-up Report 4
Full report 25/01/2015 26/01/2015 Follow-up Report 5
Full report 03/02/2015 03/02/2015 Follow-up Report 6
Full report 13/02/2015 13/02/2015 Follow-up Report 7
Full report 25/02/2015 25/02/2015 Follow-up Report 8
Full report 05/03/2015 05/03/2015 Follow-up Report 9
Full report 20/03/2015 20/03/2015 Follow-up Report 10
Full report 31/03/2015 31/03/2015 Follow-up Report 11
Full report 22/04/2015 22/04/2015 Follow-up Report 12
Full report 21/05/2015 21/05/2015 Follow-up Report 13
Full report 09/06/2015 09/06/2015 Follow-up Report 14
Full report 16/06/2015 16/06/2015 Follow-up Report 15
Full report 22/07/2015 22/07/2015 Follow-up Report 16
Full report 17/08/2015 17/08/2015 Follow-up Report 17 (Resolved : 22/07/2015 Final report )