Taiwan - 2 new outbreaks of highly pathogenic avian influenza H5N5 in poultry in farms, Yunlin County (OIE, September 21, 2020)

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Highly pathogenic avian influenza, Chinese Taipei

Information received on 21/09/2020 from Dr Wen-Jane Tu, Chief Veterinary Officer, 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. 23 Date of start of the event 09/09/2019 Date of confirmation of the event 13/09/2019 Report date 21/09/2020 Date submitted to OIE 21/09/2020 Reason for notification New strain of a listed disease in the country Causal agent Highly pathogenic avian influenza virus Serotype H5N5 Nature of diagnosis Laboratory (advanced) This event pertains to a defined zone within the country Related reports Immediate notification (23/09/2019) Follow-up report No. 1 (14/10/2019) Follow-up report No. 2 (22/11/2019) Follow-up report No. 3 (03/01/2020) Follow-up report No. 4 (06/01/2020) Follow-up report No. 5 (13/01/2020) Follow-up report No. 6 (22/01/2020) Follow-up report No. 7 (10/02/2020) Follow-up report No. 8 (20/02/2020) Follow-up report No. 9 (03/03/2020) Follow-up report No. 10 (10/03/2020) Follow-up report No. 11 (27/03/2020) Follow-up report No. 12 (07/04/2020) Follow-up report No. 13 (21/04/2020) Follow-up report No. 14 (11/05/2020) Follow-up report No. 15 (18/05/2020) Follow-up report No. 16 (01/06/2020) Follow-up report No. 17 (30/06/2020) Follow-up report No. 18 (10/08/2020) Follow-up report No. 19 (17/08/2020) Follow-up report No. 20 (21/08/2020) Follow-up report No. 21 (31/08/2020) Follow-up report No. 22 (07/09/2020) Follow-up report No. 23 (21/09/2020)

New outbreaks (2)

Outbreak 1 (2020-yl-16) Dongshi Township, Yunlin County Date of start of the outbreak 05/09/2020 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Birds 13202 4585 4585 8617 0 Affected population Native chickens(2020-yl-16)

Outbreak 2 (2020-yl-17) Shuilin Township, Yunlin County Date of start of the outbreak 11/09/2020 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Birds 14275 1143 1143 13132 0 Affected population Native chickens(2020-yl-17)

Summary of outbreaks Total outbreaks: 2 Total animals affected Species Susceptible Cases Deaths Killed and disposed of Slaughtered Birds 27477 5728 5728 21749 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Birds 20.85% 20.85% 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 Samples from Yunlin County were sent to the National Laboratory, Animal Health Research Institute (AHRI) for diagnosis. Highly pathogenic avian influenza H5N5 subtype was confirmed by AHRI. The infected farms in Yunlin County has been placed under movement restriction. All animals on the infected farms have been culled. Thorough cleaning and disinfection have been conducted after stamping out operation. Surrounding poultry farms within 3 km radius of the infected farms are under intensified surveillance for three months.

Control measures Measures applied Movement control inside the country Surveillance outside containment and/or protection zone Surveillance within containment and/or protection zone Traceability Quarantine Stamping out Zoning Disinfection 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 10/09/2020 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds gene sequencing 14/09/2020 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 09/09/2020 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 13/09/2020 Positive

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

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