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Nebraska poultry banned in four (now 6) countries after H7N9 found

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  • #16
    Re: Nebraska poultry banned in four countries after mild strain of bird flu found

    Originally posted by AnneZ View Post
    7/24/2007
    http://hygimia69.blogspot.com/2007/0...immediate.html

    [In this post: (1) OIE Immediate Notification Report: USA, LPAI H7N9; (2) Vietnam. See original texts at the source sites. EDITED.]
    (1) [USA, OIE, UPDATES, POULTRY, A/H7N9 LPAI] Low pathogenic avian influenza (poultry), United States of America Information received on 23/07/2007 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 Immediate notification Start date 25/06/2007 Date of confirmation of event 19/07/2007
    Report date 23/07/2007 Date submitted to OIE 23/07/2007
    Reason for notification Reoccurrence of a listed disease
    Date of previous occurrence 03/04/2007
    Manifestation of disease Sub-clinical infection
    Causal agent Low pathogenic avian influenza virus - Serotype H7N9 Nature of diagnosis Laboratory (basic), Laboratory (advanced)
    Report pertains to Entire country
    -
    New outbreaks
    Outbreak 1 - Seward County, Seward, NEBRASKA
    Date of start of outbreak 25/06/2007
    Outbreak status Continuing (or date resolved not submitted)
    Epidemiological unit Farm
    Affected animals
    (Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered)
    * Birds - 144000 - 0 - 0 - 0 - 45000
    Affected population
    A commercial turkey flock in Seward County, Nebraska, on routine active slaughter surveillance as part of the National Poultry Improvement Plan (NPIP) Avian Influenza Clean Program (H5 and H7) was confirmed by the National Veterinary Services Laboratory (NVSL) to have a serological detection of exposure to H7N9 avian influenza virus. Additional testing indicated no virus presence.
    No clinical signs of disease in the turkey flock prior to movement to slaughter and the turkeys passed ante-mortem inspection at a Food Safety and Inspection Service (FSIS) inspected slaughter establishment in Nebraska.
    Enhanced surveillance on the farm was implemented according to the Nebraska LPAI Response Plan, including dead bird surveillance. On 19 July, the NVSL reported that virus isolation was positive for avian influenza virus subtype H7N9. The sample was taken from young replacement turkeys that remained on the farm following the initial incident. These young replacement turkeys had previously tested negative for avian influenza.
    -
    Summary of outbreaks Total outbreaks: 1
    Outbreak statistics
    (Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible removed*)
    * Birds - 0.00% - 0.00% - ... - 31.25%
    * Removed from the susceptible population either through death, destruction or slaughter
    -
    Epidemiology
    Source of infection
    * Unknown or inconclusive
    Epidemiological comments
    On 25 June 2007, the Nebraska University Diagnostic Center (NE-UDC) reported obtaining positive serology in the turkey flock (by AGID and ELISA testing) from samples taken on routine slaughter surveillance. These samples were forwarded to NVSL for confirmation.
    There were no clinical signs of disease in the turkey flock prior to their movement to slaughter. The samples that were taken were routine samples taken at slaughter under the national monitoring program for notifiable avian influenza. The birds passed ante- and post- mortem inspection at a federal Food Safety and Inspection Service (FSIS) inspected establishment in Nebraska.
    State animal health officials placed a quarantine order on the premises and implemented the LPAI response plan. Swab samples were obtained and forwarded to NVSL.
    On 29 June 2007, the NVSL reported that avian influenza matrix rRT-PCR test was negative, and that the H5 and H7 specific rRT-PCR tests were also negative.
    With negative rRT-PCR antigen test results, the flock of 45,000 market-age turkeys were eligible for controlled marketing as determined by State and Federal animal health authorities.
    The turkeys not ready to be moved to slaughter (they were too young) were tested. On 13 July 2007, tracheal swabs gave positive results on the matrix PCR at the Nebraska University Diagnostic Center (NE-UDC). On 16 July 2007, these were confirmed by NVSL as positive on the matrix PCR, but H5/H7 negative.
    There are no other commercial facilities within a 10 Km radius of the index farm.
    All backyard flocks within a 5 Km radius of the index farm have been quarantined and tested. All tests have been negative (by PCR and/or serology).
    -
    Control measures
    Measures already applied
    * Movement control inside the country
    * Screening
    * Quarantine
    * Vaccination prohibited
    * No treatment of affected animals
    Measures to be applied
    * None specified
    -
    Diagnostic test results
    Laboratory name and type - Nebraska University Diagnostic Center (NE-UDC) (Local laboratory)
    Tests and results
    (Species - Test - Test date - Result)
    * Birds - agar-gel immunodiffusion (AGID) - 25/06/2007 - Positive
    Laboratory name and type - NE-UDC (Local laboratory)
    Tests and results
    (Species - Test - Test date - Result)
    * Birds - enzyme-linked immunosorbent assay (ELISA) - 25/06/2007 - Positive
    * Birds - real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) - 13/07/2007 - Positive
    Laboratory name and type - National Veterinary Services Laboratory (NVSL) (National laboratory)
    Tests and results
    (Species - Test - Test date - Result)
    * Birds - neuraminidase inhibition assay - 28/06/2007 - Positive
    Laboratory name and type - NVSL (National laboratory)
    Tests and results
    (Species - Test - Test date - Result)
    * Birds - haemagglutination inhibition test (HIT) - 28/06/2007 - Positive
    * Birds - real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) - 29/06/2007 - Negative
    * Birds - real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) - 16/07/2007 - Positive
    * Birds - virus isolation - 29/06/2007 - Negative
    * Birds - virus isolation - 19/07/2007 - Positive
    http://www.oie.int/wahid-prod/public..._index&admin=0

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