Low pathogenic avian influenza (poultry) H5N2, Chinese Taipei (OIE, January 18 2013): 2 New Outbreaks

[Giuseppe]

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


Low pathogenic avian influenza (poultry), Chinese Taipei


Information received on 18/01/2013 from Dr Kwo-Ching Huang, Chief Veterinary Officer and Deputy Director General, , Bureau of Animal and Plant Health Inspection and Quarantine Council of agriculture, Executive Yuan , Taipei, Chinese Taipei

• Summary
  • Report type Follow-up report No. 3
  • Date of start of the event 12/11/2012
  • Date of pre-confirmation of the event 20/11/2012
  • Report date 18/01/2013
  • Date submitted to OIE 18/01/2013
  • Reason for notification Reoccurrence of a listed disease
  • Date of previous occurrence 13/07/2012
  • Manifestation of disease Clinical disease
  • Causal agent Low pathogenic avian influenza virus
  • Serotype H5N2
  • Nature of diagnosis Laboratory (advanced)
  • This event pertains to a defined zone within the country
  • Related reports
    • Immediate notification (22/11/2012)
    • Follow-up report No. 1 (21/12/2012)
    • Follow-up report No. 2 (04/01/2013)
    • Follow-up report No. 3 (18/01/2013)
• New outbreaks (2)
  • Outbreak 1 - Ma-Gong, P'ENG-HU
    • Date of start of the outbreak 20/12/2012
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Birds - 1211 ? 38 ? 23 ? ? ? ?
      • Affected population 1,206 native chickens and 5 turkeys
  • Outbreak 2 - Zao-Ciao, MIAO-LI
    • Date of start of the outbreak 27/12/2012
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Birds - 268 ? 18 ? 12 ? ? ? ?
      • Affected population 237 native chickens, 19 ducks and 12 geese
• Summary of outbreaks
  • Total outbreaks: 2
  • Total animals affected: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
    • Birds ? 1479 ? 56 ? 35 ? ? ? ?
  • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
    • Birds - 3.79% - 2.37% - 62.50% ? **
    • *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
  • According to negative results of follow-up virological tests conducted on the LPAI affected farm in Chia-I county reported on 22 November 2012, movement restriction on the affected farm was lifted by the local disease control center (LDCC).
  • First round intensified surveillance of surrounding poultry farms within the 3-km-radius area around the affected farm was completed and no other notifiable avian influenza (NAI) case was detected.
  • During intensified surveillance conducted on 3-km-radius area around the first H5N2 affected farm in Peng-Hu county reported on 20 December 2012, another H5N2 outbreak was detected and confirmed as LPAI by the Animal Health Research Institute (AHRI) in accordance with the result of pathogenicity test.
  • Movement restriction of the poultry on the farm was conducted, and the epidemiological and clinical health investigations of surrounding poultry farms were carried out. Up to the present, no other NAI case was observed or detected.
  • Suspected case in Miao-Li county was reported by the owner because of suspicious clinical signs.
  • The LDCC conducted movement restrictions, epidemiological investigation and sampling on the affected poultry farm at the time.
  • The AHRI subsequently confirmed this case as H5N2 subtype LPAI according to the results of virological and pathogenicity tests.
• 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 Institute (AHRI) (National laboratory) ? Birds - gene sequencing - 29/12/2012 ? Negative
    • Animal Health Research Institute (AHRI) (National laboratory) ? Birds - gene sequencing - 07/01/2013 ? Negative
    • Animal Health Research Institute (AHRI) (National laboratory) ? Birds - haemagglutination inhibition test (HIT) - 11/01/2013 ? Positive
    • Animal Health Research Institute (AHRI) (National laboratory) ? Birds - intravenous pathogenicity index (IVPI) test - 18/01/2013 ? Negative
    • Animal Health Research Institute (AHRI) (National laboratory) ? Birds - intravenous pathogenicity index (IVPI) test - 18/01/2013 ? Negative
    • Animal Health Research Institute (AHRI) (National laboratory) ? Birds - virus isolation - 28/12/2012 ? Positive
    • Animal Health Research Institute (AHRI) (National laboratory) ? Birds - virus isolation - 04/01/2013 ? Positive
    • Animal Health Research Institute (AHRI) (National laboratory) ? Birds - virus isolation - 11/01/2013 ? Negative
• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

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