Low pathogenic avian influenza (poultry), Chinese Taipei (WAHID Interface - OIE World Animal Health Information Database, 2/11/10)

[Giuseppe]

Low pathogenic avian influenza (poultry), Chinese Taipei (WAHID Interface - OIE World Animal Health Information Database, 2/11/10)

Low pathogenic avian influenza (poultry), Chinese Taipei

Information received on 11/02/2010 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. 1
  • Start date 09/01/2010
  • Date of first confirmation of the event 21/01/2010
  • Report date 11/02/2010
  • Date submitted to OIE 11/02/2010
  • Reason for notification Reoccurrence of a listed disease
  • Date of previous occurrence 14/11/2008
  • Manifestation of disease Clinical disease
  • Causal agent Low pathogenic avian influenza virus
  • Serotype H5N2
  • Nature of diagnosis Clinical, Laboratory (advanced)
  • This event pertains to a defined zone within the country
  • Related reports
    • Immediate notification (21/01/2010)
    • Follow-up report No. 1 (11/02/2010)

• New outbreaks
  • Outbreak 1 - Fang-Yuan township, CHANG-HUA
    • Date of start of the outbreak 27/01/2010
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
      • Birds - 29000 - 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 - 0.07% - 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 outbreak identified on 9 January 2010, epidemiological and clinical health investigation has been conducted in a total of 113 poultry farms within a 3-km-radius of the index farm. In this investigation, a layer farm was tested positive by virus isolation. Movement control on this farm has also been implemented. The results of clinical findings, laboratory tests and basic amino acid motifs of the HA0 cleavage site demonstrate that the virulence of the virus is low pathogenic. The IVPI test and the sequence of nucleic acid of this virus isolate are on-going and the result will be reported to the OIE.
  • As to the index farm, the local veterinary authority has collected samples again for the detection of the virus and a negative result was obtained on 5 February 2010. By determining the basic amino acid of the cleavage site of the haemagglutinin and by IVPI test (IVPI=0) and gene sequencing, it has been demonstrated that the virulence of the virus is low pathogenic. The movement control on the farm was released by the local veterinary authority on 5 February 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 - gene sequencing - 22/01/2010 - Positive
      • Birds - haemagglutination inhibition test (HIT) - 05/02/2010 - Positive
      • Birds - haemagglutination inhibition test (HIT) - 08/02/2010 - Negative
      • Birds - intravenous pathogenicity index (IVPI) test - 03/02/2010 - Negative
      • Birds - reverse transcription - polymerase chain reaction (RT-PCR) - 05/02/2010 - Negative
      • Birds - reverse transcription - polymerase chain reaction (RT-PCR) - 08/02/2010 - Negative
      • Birds - virus isolation - 05/02/2010 - Negative
      • Birds - virus isolation - 08/02/2010 - Positive

• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

(...)
-
​

<cite cite="http://www.oie.int/wahis/public.php?page=single_report&pop=1&reportid=8889">WAHID Interface - OIE World Animal Health Information Database</cite>