7 Dec 2012

Highly pathogenic avian influenza H5N2, Chinese Taipei (OIE World Animal Health Information System, December 7 2012, edited)

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

Highly pathogenic avian influenza, Chinese Taipei

Information received on 07/12/2012 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 Immediate notification
    • Date of start of the event 17/11/2012
    • Date of pre-confirmation of the event 22/11/2012
    • Report date 07/12/2012
    • Date submitted to OIE 07/12/2012
    • Reason for notification Reoccurrence of a listed disease
    • Date of previous occurrence 07/08/2012
    • Manifestation of disease Clinical disease
    • Causal agent Highly pathogenic avian influenza virus
    • Serotype H5N2
    • Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced), Necropsy
    • This event pertains to the whole country
  • New outbreaks (1) 
    • Outbreak 1  - Ma-Gong, P'ENG-HU
      • Date of start of the outbreak 17/11/2012
      • Outbreak status Continuing (or date resolved not provided)
      • Epidemiological unit Farm
      • Affected animals: Species – Susceptible – Cases – Deaths – Destroyed – Slaughtered
        • Birds  - 831 – 300 – 200 – 631 – 0
        • Affected population Native chicken
  • Summary of outbreaks
    • Total outbreaks: 1
    • Total animals affected: Species – Susceptible – Cases – Deaths – Destroyed – Slaughtered
      • Birds – 831 – 300 – 200 – 631 – 0
    • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
      • Birds - 36.10% - 24.07% - 66.67% - 100.00%
      • *Removed from the susceptible population through death, destruction and/or slaughter
  • Epidemiology
    • Source of the outbreak(s) or origin of infection
      • Unknown or inconclusive
  • Epidemiological comments
    • Clinical suspected cases were notified by the owner because of the abnormal mortality rate.
    • The local government conducted movement restriction, epidemiological investigation and sampling on the index native chicken farm and destroyed all chickens as the measure for precaution on 22 November 2012 in accordance with its authority.
    • The results of RT-PCR and pathogenicity tests confirmed this event as H5N2 HPAI.
    • The clinical and epidemiological investigation of three surrounding poultry farms was conducted.
    • No other NAI case was detected.
  • Control measures
    • Measures applied
      • Stamping out
      • 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 (National laboratory) – Birds - gene sequencing - 24/11/2012 – Positive
      • Animal Health Research Institute (National laboratory) – Birds - haemagglutination inhibition test (HIT) - 22/11/2012 – Negative
      • Animal Health Research Institute (National laboratory) – Birds - intravenous pathogenicity index (IVPI) test  - 07/12/2012 – Positive
      • Animal Health Research Institute (National laboratory) – Birds - reverse transcription - polymerase chain reaction (RT-PCR) - 22/11/2012 – Positive
      • Animal Health Research Institute (National laboratory) – Birds - virus isolation - 07/12/2012 – Positive
  • Future Reporting
    • The event is continuing. Weekly follow-up reports will be submitted.

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