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Taiwan - 3 new outbreaks of low pathogenic avian influenza H5N2 in birds in farms, Chiayi, Tainan, Yunlin (OIE, June 16, 2017)

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  • Taiwan - 3 new outbreaks of low pathogenic avian influenza H5N2 in birds in farms, Chiayi, Tainan, Yunlin (OIE, June 16, 2017)

    Low pathogenic avian influenza (poultry),
    Chinese Taipei
    Information received on 16/06/2017 from Dr Tai-Hwa Shih, Chief Veterinary Officer, Deputy Director General, Bureau of Animal and Plant Health Inspection and Quarantine Council of Agriculture Executive Yuan, Ministry of Agriculture, Taipei, Chinese Taipei
    Summary
    Report type Follow-up report No. 6
    Date of start of the event 12/01/2015
    Date of confirmation of the event 14/01/2015
    Report date 16/06/2017
    Date submitted to OIE 16/06/2017
    Reason for notification Recurrence of a listed disease
    Date of previous occurrence 2014
    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 (22/04/2015)
    Follow-up report No. 1 (12/05/2015)
    Follow-up report No. 2 (27/07/2015)
    Follow-up report No. 3 (23/11/2015)
    Follow-up report No. 4 (03/03/2016)
    Follow-up report No. 5 (01/05/2017)
    Follow-up report No. 6 (16/06/2017)
    New outbreaks (3)
    Outbreak 1 (2016-cy-1) Minxiong Township, CHIAYI COUNTY
    Date of start of the outbreak 13/01/2016
    Outbreak status Continuing (or date resolved not provided)
    Epidemiological unit Farm
    Affected animals
    Species Susceptible Cases Deaths Killed and disposed of Slaughtered
    Birds 500 5 5 0 0
    Affected population Turkeys (2016-cy-1)
    Outbreak 2 (2017-tn-1) Xiaying Distrct, TAINAN CITY
    Date of start of the outbreak 07/04/2017
    Outbreak status Continuing (or date resolved not provided)
    Epidemiological unit Farm
    Affected animals
    Species Susceptible Cases Deaths Killed and disposed of Slaughtered
    Birds 21834 534 534 0 0
    Affected population Chickens (2017-tn-1)
    Outbreak 3 (2017-yl-1) Dongshi Township, YUNLIN COUNTY
    Date of start of the outbreak 10/04/2017
    Outbreak status Continuing (or date resolved not provided)
    Epidemiological unit Farm
    Affected animals
    Species Susceptible Cases Deaths Killed and disposed of Slaughtered
    Birds 28000 2500 2500 0 0
    Affected population Native chickens (2017-yl-1)
    Summary of outbreaks Total outbreaks: 3
    Total animals affected
    Species Susceptible Cases Deaths Killed and disposed of Slaughtered
    Birds 50334 3039 3039 0 0
    Outbreak statistics
    Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
    Birds 6.04% 6.04% 100.00% 6.04%
    *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 Abnormal mortalities were observed in 3 poultry farms in Tainan City, Yunlin County and Chiayi County. Samples were sent to the National Laboratory, the Animal Health Research Institute (AHRI) for diagnosis. H5N2 subtype low pathogenic avian influenza (LPAI) was confirmed by AHRI. These farms were put under movement restrictions. The pathogenicity of the virus was subsequently confirmed by the AHRI as low pathogenic (less than 75% mortality of the tested chickens) on 8 June 2017. Surrounding poultry farms within 3 km radius of the infected farms were under intensified surveillance for 3 months.
    Control measures
    Measures applied
    • Movement control inside the country
    • Screening
    • Quarantine
    • Zoning
    • 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 16/01/2016 Positive
    Animal Health Research Institute (AHRI) (National laboratory) Birds gene sequencing 10/04/2017 Positive
    Animal Health Research Institute (AHRI) (National laboratory) Birds gene sequencing 13/04/2017 Positive
    Animal Health Research Institute (AHRI) (National laboratory) Birds intravenous pathogenicity index (IVPI) test 09/06/2017 Positive
    Animal Health Research Institute (AHRI) (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 15/01/2016 Positive
    Animal Health Research Institute (AHRI) (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 09/04/2017 Positive
    Animal Health Research Institute (AHRI) (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 12/04/2017 Positive
    Future Reporting
    The event is continuing. Weekly follow-up reports will be submitted.
    ...
    http://www.oie.int/wahis_2/public/wa...reportid=24045
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