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

[Giuseppe]

[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 Ta?wan, Council of Agriculture, Ta?wan, 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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