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Highly pathogenic avian influenza, Hong Kong (P.R. China) (4/17/2009) [WAHID Interface - OIE]

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  • Highly pathogenic avian influenza, Hong Kong (P.R. China) (4/17/2009) [WAHID Interface - OIE]

    Highly pathogenic avian influenza, Hong Kong (P.R. China) (4/17/2009) [WAHID Interface - OIE]
    Highly pathogenic avian influenza, Hong Kong (P.R. China)

    Information received on 16/04/2009 from Dr Thomas Sit, Assistant Director , Inspection & Quarantine, Agriculture, Fisheries and Conservation Department, Cheung Sha Wan , Hon Kong , Hong Kong (P.R. China)

    -- Summary
    Report type Follow-up report No. 1 (Final report)
    Start date 29/01/2009
    Date of first confirmation of the event 31/01/2009
    Report date 16/04/2009
    Date submitted to OIE 16/04/2009
    Date event resolved 16/04/2009
    Reason for notification Reoccurrence of a listed disease
    Date of previous occurrence 01/2009
    Manifestation of disease Sub-clinical infection
    Causal agent Highly pathogenic avian influenza virus Serotype H5N1
    Nature of diagnosis Laboratory (advanced)
    This event pertains to the whole country
    Related reports
    * Immediate notification (13/02/2009)
    * Follow-up report No. 1 (16/04/2009)

    -- New outbreaks

    - Outbreak 1 - Ping Chau, HONG KONG
    Date of start of the outbreak 12/02/2009
    Outbreak status Resolved (12/02/2009)
    Epidemiological unit Not applicable
    Affected animals: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
    - Wild species - 1 - 1 - 0 - 0
    Affected population A crested myna. Crested Myna is an abundant breeding resident in Hong Kong.

    - Outbreak 2 - Ping Chau, HONG KONG
    Date of start of the outbreak 03/03/2009
    Outbreak status Resolved (03/03/2009)
    Epidemiological unit Not applicable
    Affected animals: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
    - Birds - 2 - 2 - 0 - 0
    Affected population Two chicken detected off the coast of the Island Ping Chau

    -- Summary of outbreaks
    Total outbreaks: 2
    Total animals affected: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
    - Wild species - 1 - 1 - 0 - 0
    - Birds - 2 - 2 - 0 - 0
    Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
    - Wild species - ** - ** - 100.00% - **
    - Birds - ** - ** - 100.00% - **
    * 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
    New outbreaks (Ping Chau):
    - Poultry carcasses from unknown sources were detected off the coast of the Island Ping Chau. The carcasses were badly decomposed at the time of collection. No other outbreak has been detected in this area for the past 42 days since the finding of the carcasses.
    - The H5N1 positive wild bird was detected in the ongoing surveillance program on wild birds. No spread of disease was evident.Previous outbreaks (immediate notification): No other outbreak has been detected for the past 70 days since the last positive case occurred.
    An intensive surveillance system is in place on all poultry farms, poultry markets, pet bird shops, park birds and wild birds in Hong Kong.
    Since February 2006, the HKSAR Government has banned backyard poultry farming and daily rural patrols throughout the territory have been put in place since then. This activity has been enhanced since the occurrence of the event. No poultry farm or backyard poultry farming activities were detected within the 3-km-radius affected zones. The monitoring on local poultry farms was also enhanced and no irregularity was detected.

    -- Control measures
    Measures applied
    * Screening
    * Disinfection of infected premises/establishment(s)
    * No vaccination
    * No treatment of affected animals
    Measures to be applied
    * No other measures

    -- Diagnostic test results
    Laboratory name and type Department of Microbiology, University de Hong Kong (National laboratory)
    Tests and results: Species - Test - Test date - Result
    - Birds - gene sequencing - 19/02/2009 - Positive
    - Birds - gene sequencing - 13/03/2009 - Positive
    - Wild species - gene sequencing - 13/03/2009 - Positive
    Laboratory name and type Tai Lung Veterinary Laboratory Agriculture, Fisheries and Conservation Department (National laboratory)
    Tests and results: Species - Test - Test date - Result
    - Birds - immunohistochemical test - 05/02/2009 - Positive
    - Birds - polymerase chain reaction (PCR) - 05/02/2009 - Positive
    - Birds - polymerase chain reaction (PCR) - 04/03/2009 - Positive
    - Birds - virus isolation - 07/02/2009 - Positive
    - Birds - virus isolation - 06/03/2009 - Positive
    - Wild species - immunohistochemical test - 14/02/2009 - Positive
    - Wild species - polymerase chain reaction (PCR) - 14/02/2009 - Positive
    - Wild species - virus isolation - 19/02/2009 - Positive

    -- Future Reporting
    The event is resolved. No more reports will be submitted.
    -
    <cite cite="http://www.oie.int/wahis/public.php?page=single_report&pop=1&reportid=8025" >WAHID Interface - OIE World Animal Health Information Database</cite>
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