[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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