Low pathogenic avian influenza (poultry), Chinese Taipei (OIE, May 30 2011): One New H7N3 Poultry Outbreak

[Giuseppe]

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

Low pathogenic avian influenza (poultry), Chinese Taipei


Information received on 30/05/2011 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 28/03/2011
  • Date of first confirmation of the event 07/04/2011
  • Report date 30/05/2011
  • Date submitted to OIE 30/05/2011
  • Reason for notification Reoccurrence of a listed disease
  • Date of previous occurrence 11/02/2011
  • Manifestation of disease Sub-clinical infection
  • Causal agent Low pathogenic avian influenza virus
  • Serotype H7N3
  • Nature of diagnosis Laboratory (advanced)
  • This event pertains to a defined zone within the country
  • Related reports
    • Immediate notification (11/04/2011)
    • Follow-up report No. 1 (22/04/2011)
    • Follow-up report No. 2 (30/05/2011)
• New outbreaks
  • Outbreak 1 - Dalin Township, CHIA-I
    • Date of start of the outbreak 20/05/2011
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Birds ? 1900 ? 20 ? 0 ? 0 ? 0
• Summary of outbreaks
  • Total outbreaks: 1
  • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
    • Birds - 1.05% - 0.00% - 0.00% - 0.00%
    • * 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
  • After the H7N3 outbreak confirmed on 7 April 2011, epidemiological investigation and intensified surveillance were carried out on the surrounding poultry farms within a 3-km-radius area around the index farm.
  • Samples taken from a duck breeder tested positive with both RT-PCR and virus isolation, and identified as H7N3 strain avian influenza virus (AIV) on 26 May 2011.
  • Movement restriction was implemented on the farm immediately after AIV was detected.
  • Clinical investigation on that farm was done and the result showed that the breeders in the farm were healthy without abnormal mortality.
  • The pathogenicity assays of this virus isolate are now in progress.
  • Note by the OIE Animal Health Information Department: H5 and H7 avian influenza in its low pathogenic form in poultry is a notifiable disease as per Chapter 10.4. on avian influenza of the Terrestrial Animal Health Code (2010).
• 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 Animal Health Research Institute (National laboratory)
    • Tests and results: Species ? Test - Test date ? Result
      • Birds - haemagglutination inhibition test (HIT) - 26/05/2011 ? Positive
      • Birds - reverse transcription - polymerase chain reaction (RT-PCR) - 26/05/2011 ? Positive
      • Birds - virus isolation - 26/05/2011 ? Positive
• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

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