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US - California: 2 new outbreaks of Highly pathogenic avian influenza H5N8 in wild birds (American wigeon), Colusa and Solano Counties OIE

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  • US - California: 2 new outbreaks of Highly pathogenic avian influenza H5N8 in wild birds (American wigeon), Colusa and Solano Counties OIE

    Highly pathogenic avian influenza,
    United States of America
    Information received on 31/03/2015 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. 11
    Date of start of the event 10/12/2014
    Date of pre-confirmation of the event 14/12/2014
    Report date 31/03/2015
    Date submitted to OIE 31/03/2015
    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 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)
    Follow-up report No. 6 (03/02/2015)
    Follow-up report No. 7 (13/02/2015)
    Follow-up report No. 8 (25/02/2015)
    Follow-up report No. 9 (05/03/2015)
    Follow-up report No. 10 (20/03/2015)
    Follow-up report No. 11 (31/03/2015)
    New outbreaks (2)
    Outbreak 1 Colusa County, Colusa, CALIFORNIA
    Date of start of the outbreak 24/03/2015
    Outbreak status Continuing (or date resolved not provided)
    Epidemiological unit Not applicable
    Affected animals
    Species Susceptible Cases Deaths Destroyed Slaughtered
    American wigeon:Anas americana(Anatidae)
    Affected population Wild bird surveillance
    Outbreak 2 Solano County, Solano, CALIFORNIA
    Date of start of the outbreak 24/03/2015
    Outbreak status Continuing (or date resolved not provided)
    Epidemiological unit Not applicable
    Affected animals
    Species Susceptible Cases Deaths Destroyed Slaughtered
    American wigeon:Anas americana(Anatidae)
    Affected population Wild bird surveillance
    Summary of outbreaks Total outbreaks: 2
    Total animals affected
    Species Susceptible Cases Deaths Destroyed Slaughtered
    American wigeon:Anas americana(Anatidae) **
    Outbreak statistics
    Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
    American wigeon:Anas americana(Anatidae) ** ** ** **
    *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. To date, all enhanced surveillance and testing for avian influenza around the affected premises has been negative for avian influenza.
    Control measures
    Measures applied
    • Quarantine
    • Movement control inside the country
    • Zoning
    • Disinfection of infected premises/establishment(s)
    • Modified stamping out
    • 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) American wigeon real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 24/03/2015 Positive
    National Veterinary Services Laboratories (NVSL) (National laboratory) American wigeon virus sequencing 24/03/2015 Positive
    Future Reporting
    The event is continuing. Weekly follow-up reports will be submitted.
    .../
    http://www.oie.int/wahis_2/public/wa...reportid=17454
    "Safety and security don't just happen, they are the result of collective consensus and public investment. We owe our children, the most vulnerable citizens in our society, a life free of violence and fear."
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