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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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.

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