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PostPosted: Mon Jan 26, 2015 11:31 am 
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OIE report on 145,000 turkeys at Foster Farms cite a match of >99% with first H5N8 case in North America, A/gyrfalcon/WA/41088-6/2014.

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PostPosted: Mon Jan 26, 2015 11:32 am 
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The partial HA/NA sequences are >99% similar to A/gyrfalcon/WA/41088-6/2014 based upon direct sequencing from swabs of 2 different turkeys.
http://www.oie.int/wahis_2/public/wahid ... rtid=17060

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PostPosted: Mon Jan 26, 2015 11:35 am 
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Information received on 26/01/2015 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. 5
Date of start of the event 10/12/2014
Date of pre-confirmation of the event 14/12/2014
Report date 25/01/2015
Date submitted to OIE 26/01/2015
Reason for notification Reoccurrence of a listed disease
Date of previous occurrence 2004
Manifestation of disease Clinical disease
Causal agent Highly pathogenic avian influenza
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)
New outbreaks (1)
Outbreak 1 Stanislaus County, Stanislaus, CALIFORNIA
Date of start of the outbreak 19/01/2015
Outbreak status Continuing (or date resolved not provided)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 145000 4500 1200
Affected population A commercial turkey operation. Only one house of 9000 birds on the facility has been affected and showing increased mortality.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 145000 ** 4500 1200
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds ** 3.10% ** **
*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, are continuing to conduct 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 the EA/AM H5N2-reassortant detected in Canada and the US. These findings are not unexpected as the EA-H5N8 virus continues to circulate. The EA H5 clade 2.3.4.4 viruses are highly pathogenic for poultry. The detection of the HPAI H5N8 in the commercial turkey flock is considered to be related to the recent avian influenza events in wild birds. The partial HA/NA sequences are >99% similar to A/gyrfalcon/WA/41088-6/2014 based upon direct sequencing from swabs of 2 different turkeys. The commercial turkey premises is in a remote location and has been quarantined. Comprehensive epidemiological investigation and enhanced surveillance is being conducted. Additional recent testing of other turkey houses on the premises has been negative for avian influenza.
Control measures
Measures applied
Stamping out
Quarantine
Movement control inside the country
Disinfection of infected premises/establishment(s)
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) 23/01/2015 Positive
National Veterinary Services Laboratories (NVSL) (National laboratory) Birds virus sequencing 23/01/2015 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.

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