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Highly pathogenic avian influenza H5N2, Chinese Taipei (OIE, May 2 2014): 2 chickens at a Taipei City wholesale market

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  • Highly pathogenic avian influenza H5N2, Chinese Taipei (OIE, May 2 2014): 2 chickens at a Taipei City wholesale market

    [Source: OIE, full page: (LINK). Edited.]


    Highly pathogenic avian influenza H5N2, Chinese Taipei


    Information received on 02/05/2014 from Dr Ping-Cheng Yang, Director, Animal Technology Institute Taοwan, Council of Agriculture, Taοwan, Chinese Taipei
    • Summary
      • Report type Immediate notification
      • Date of start of the event 15/04/2014
      • Date of pre-confirmation of the event 23/04/2014
      • Report date 02/05/2014
      • Date submitted to OIE 02/05/2014
      • Reason for notification Reoccurrence of a listed disease
      • Date of previous occurrence 28/03/2013
      • Manifestation of disease Sub-clinical infection
      • Causal agent Highly pathogenic avian influenza virus
      • Serotype H5N2
      • Nature of diagnosis Laboratory (advanced)
      • This event pertains to a defined zone within the country
    • New outbreaks (1)
      • Outbreak 1 - Wanhua District, TAIPEI CITY
        • Date of start of the outbreak 15/04/2014
        • Outbreak status Continuing (or date resolved not provided)
        • Epidemiological unit Not applicable
        • Affected animals: Species – Susceptible – Cases – Deaths – Destroyed – Slaughtered
          • Birds – … – 2 – 2 – 0 – 0
          • Affected population Native chickens
    • Summary of outbreaks
      • Total outbreaks: 1
        • Total animals affected: Species – Susceptible – Cases – Deaths – Destroyed – Slaughtered
          • Birds - … – 2 – 2 – 0 – 0
        • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
          • 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
      • An intensive active surveillance was conducted on a wholesale poultry market in Taipei City since April 2014.
      • One hundred serums, 100 fecal swabs and 6 dead chickens were collected for serological and virological tests.
      • The H5N2 subtype of avian influenza virus was isolated in one dead native chicken body sample on 23 April 2014, but it was not in the other samples.
      • By tracing back on 23 April 2014, the original chicken farm in Yunlin County had no chicken remained, but movement control was immediately conducted on the farm.
      • The pathogenicity of the virus was confirmed by the national laboratory as highly pathogenic (>75% mortality of tested chickens) on 2 May 2014.
      • Samples were taken from 8 poultry farms in a 1-km radius around the original farm and confirmed all negative by virus isolation.
      • After thorough cleaning and disinfection of this index farm, sentinel poultry test will be implemented to affirm non-viral activity in the environment.
      • The transaction activities at the wholesale poultry market were stopped for one day to conduct thorough cleaning and disinfection.
      • There were no poultry farms located within the 3-km radius area around the market.
    • Control measures
      • Measures applied
        • Quarantine
        • Movement control inside the country
        • Screening
        • Zoning
        • 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
        • Animal Health Research (National laboratory) – Birds - gene sequencing - 25/04/2014 – Positive
        • Animal Health Research (National laboratory) – Birds - inoculation test - 02/05/2014 – Positive
        • Animal Health Research (National laboratory) – Birds - virus isolation - 23/04/2014 – Positive
    • Future Reporting
      • The event is continuing. Weekly follow-up reports will be submitted.
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