Highly pathogenic avian influenza, Chinese Taipei (OIE, March 19 2012): 1 New H5N2 Outbreak

[Giuseppe]

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


Highly pathogenic avian influenza, Chinese Taipei


Information received on 19/03/2012 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 Follow-up report No. 2
  • Start date 07/02/2012
  • Date of first confirmation of the event 13/02/2012
  • Report date 19/03/2012
  • Date submitted to OIE 19/03/2012
  • Reason for notification First occurrence of a listed disease
  • Manifestation of disease Clinical disease
  • Causal agent Highly pathogenic avian influenza virus
  • Serotype H5N2
  • Nature of diagnosis Clinical, Laboratory (advanced)
  • This event pertains to the whole country
  • Related reports
    • Immediate notification (03/03/2012)
    • Follow-up report No. 1 (10/03/2012)
    • Follow-up report No. 2 (19/03/2012)
• New outbreaks
  • Outbreak 1 - Chu-Tang Township, CHANG-HUA
    • Date of start of the outbreak 05/03/2012
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Birds ? 8647 ? 426 ? 426 ? 8221 ? 0
      • Affected Population:
        • Layer chicken
• Summary of outbreaks
  • Total outbreaks: 1
  • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
    • Birds - 4.93% - 4.93% - 100.00% - 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 cases were notified by the veterinary and an abnormal mortality rate was noticed.
  • The local disease control center (LDCC) conducted movement restrictions, clinical inspection, epidemiological investigation and sampling on the index layer farm.
  • The results of RT-PCR test, HA0 cleavage site sequencing and pathogenicity test demonstrated H5N2 subtype of HPAI.
  • All the layer chickens on the farm were destroyed by LDCC as a measure of precaution on 8 March 2012.
  • Clinical and epidemiological investigation of surrounding poultry farms was conducted.
  • No other case or evidence of infection 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 Animal Health Research Institute (National laboratory)
    • Tests and results: Species ? Test - Test date ? Result
      • Birds - gene sequencing - 08/03/2012 ? Positive
      • Birds - haemagglutination inhibition test (HIT) - 09/03/2012 ? Positive
      • Birds - intravenous pathogenicity index (IVPI) test - 16/03/2012 ? Positive
      • Birds - reverse transcription - polymerase chain reaction (RT-PCR) - 08/03/2012 ? Positive
      • Birds - virus isolation - 09/03/2012 ? Positive
• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

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