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US - 1 new outbreak of low pathogenic avian influenza H7N1 in commercial broiler breeder flock in farm, Hopkins county, Texas (OIE, March 9, 2018)

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  • US - 1 new outbreak of low pathogenic avian influenza H7N1 in commercial broiler breeder flock in farm, Hopkins county, Texas (OIE, March 9, 2018)

    Low pathogenic avian influenza (poultry),
    United States of America
    Information received on 09/03/2018 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
    Summary
    Report type Immediate notification
    Date of start of the event 06/03/2018
    Date of confirmation of the event 08/03/2018
    Report date 09/03/2018
    Date submitted to OIE 09/03/2018
    Reason for notification Recurrence of a listed disease
    Date of previous occurrence 2017
    Manifestation of disease Clinical disease
    Causal agent Low pathogenic avian influenza virus
    Serotype H7N1
    Nature of diagnosis Laboratory (basic), Laboratory (advanced)
    This event pertains to a defined zone within the country
    New outbreaks (1)
    Outbreak 1 Hopkins county, Hopkins, TEXAS
    Date of start of the outbreak 06/03/2018
    Outbreak status Continuing (or date resolved not provided)
    Epidemiological unit Farm
    Affected animals
    Species Susceptible Cases Deaths Killed and disposed of Slaughtered
    Birds 24091
    Affected population Commercial broiler breeder flock
    Summary of outbreaks Total outbreaks: 1
    Total animals affected
    Species Susceptible Cases Deaths Killed and disposed of Slaughtered
    Birds 24091 **
    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
    • Unknown or inconclusive
    Epidemiological comments As part of routine, pre-slaughter testing and surveillance for H5/H7 avian influenza, H7N1 low pathogenic avian influenza (LPAI) was detected in a commercial broiler breeder flock based upon H7 PCR and antibody to H7 and N1. Partial HA sequencing determined the H7 to be a low pathogenic virus of North American wild bird lineage. Further characterization is pending virus recovery. The flock exhibited a slight increase in mortality and a decrease in egg production. Depopulation of the premises is underway. The USDA Animal Plant Health Inspection Service (APHIS) and the Texas Animal Health Commission are conducting a comprehensive epidemiological investigation of this incident and have implemented enhanced surveillance and testing within 10km of this finding.
    Control measures
    Measures applied
    • Movement control inside the country
    • Surveillance outside containment and/or protection zone
    • Surveillance within containment and/or protection zone
    • Quarantine
    • Zoning
    • Vaccination prohibited
    • No treatment of affected animals
    Measures to be applied
    • Disinfection
    Diagnostic test results
    Laboratory name and type Species Test Test date Result
    Texas A&M Veterinary Medical Diagnostic Laboratory (Local laboratory) Birds enzyme-linked immunosorbent assay (ELISA) 07/03/2018 Positive
    Texas A&M Veterinary Medical Diagnostic Laboratory (Local laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 07/03/2018 Positive
    National Veterinary Services Laboratory (National laboratory) Birds enzyme-linked immunosorbent assay (ELISA) 07/03/2018 Positive
    National Veterinary Services Laboratory (National laboratory) Birds haemagglutination inhibition test (HIT) 07/03/2018 Positive
    National Veterinary Services Laboratory (National laboratory) Birds real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 08/03/2018 Positive
    National Veterinary Services Laboratory (National laboratory) Birds virus isolation Pending
    Future Reporting
    The event is continuing. Weekly follow-up reports will be submitted.
    ...
    http://www.oie.int/wahis_2/public/wa...reportid=26131
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