Taiwan - 2 new outbreaks of highly pathogenic avian influenza H5N5 in poultry in farm and slaughterhouse, Yunlin County, Taipei City (OIE, September 07, 2020)

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Highly pathogenic avian influenza, Chinese Taipei

Information received on 07/09/2020 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. 22 Date of start of the event 09/09/2019 Date of confirmation of the event 13/09/2019 Report date 07/09/2020 Date submitted to OIE 07/09/2020 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)

New outbreaks (2)

Outbreak 1 (2020-yl-15) Taixi Township, Yunlin County Date of start of the outbreak 17/08/2020 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Birds 4666 20 0 4666 0 Affected population Meat ducks(2020-yl-15)

Outbreak 2 (2020-tp-6) Wanhua District, Taipei City Date of start of the outbreak 23/08/2020 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Slaughterhouse Affected animals Species Susceptible Cases Deaths Killed and disposed of Slaughtered Birds 4 1 0 4 0 Affected population Native chickens(2020-tp-6)

Summary of outbreaks Total outbreaks: 2 Total animals affected Species Susceptible Cases Deaths Killed and disposed of Slaughtered Birds 4670 21 0 4670 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Birds 0.45% 0.00% 0.00% 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 farm in Yunlin County has been placed under movement restriction. All animals on the infected farm have been culled. Thorough cleaning and disinfection have been conducted after stamping out operation. Surrounding poultry farms within 3 km radius of the infected farm are under intensified surveillance for three months. Suspected signs were observed in poultry carcasses during post-mortem inspection in the abattoir in Taipei City. Samples were sent to the AHRI for diagnosis. H5N5 subtype HPAI was confirmed by the AHRI. The carcasses were destroyed and thorough cleaning and disinfection have been conducted in the abattoir. After tracing back to the farm of origin, any positive results will be included in follow-up reports.

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 19/08/2020 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds gene sequencing 25/08/2020 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds gene sequencing 27/08/2020 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 18/08/2020 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 24/08/2020 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 26/08/2020 Positive

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

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