Taiwan - 4 new outbreaks of highly pathogenic avian influenza H5N2 in poultry farms in Changhua and Yunlin Counties (OIE, October 2, 2015)

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Highly pathogenic avian influenza, Chinese Taipei

Information received on 02/10/2015 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. 34 Date of start of the event 07/01/2015 Date of confirmation of the event 11/01/2015 Report date 02/10/2015 Date submitted to OIE 02/10/2015 Reason for notification Reoccurrence of a listed disease Date of previous occurrence 23/07/2014 Manifestation of disease Clinical disease Causal agent Highly 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 (12/01/2015) Follow-up report No. 1 (13/01/2015) Follow-up report No. 2 (15/01/2015) Follow-up report No. 3 (16/01/2015) Follow-up report No. 4 (19/01/2015) Follow-up report No. 5 (21/01/2015) Follow-up report No. 6 (28/01/2015) Follow-up report No. 7 (04/02/2015) Follow-up report No. 8 (11/02/2015) Follow-up report No. 9 (17/02/2015) Follow-up report No. 10 (26/02/2015) Follow-up report No. 11 (04/03/2015) Follow-up report No. 12 (12/03/2015) Follow-up report No. 13 (19/03/2015) Follow-up report No. 14 (25/03/2015) Follow-up report No. 15 (02/04/2015) Follow-up report No. 16 (14/04/2015) Follow-up report No. 17 (17/04/2015) Follow-up report No. 18 (24/04/2015) Follow-up report No. 19 (01/05/2015) Follow-up report No. 20 (11/05/2015) Follow-up report No. 21 (18/05/2015) Follow-up report No. 22 (29/05/2015) Follow-up report No. 23 (04/06/2015) Follow-up report No. 24 (12/06/2015) Follow-up report No. 25 (18/06/2015) Follow-up report No. 26 (07/07/2015) Follow-up report No. 27 (13/07/2015) Follow-up report No. 28 (20/07/2015) Follow-up report No. 29 (27/07/2015) Follow-up report No. 30 (31/07/2015) Follow-up report No. 31 (11/08/2015) Follow-up report No. 32 (24/08/2015) Follow-up report No. 33 (04/09/2015) Follow-up report No. 34 (02/10/2015)

New outbreaks (4)

Outbreak 1 Pitou Township, CHANGHUA COUNTY Date of start of the outbreak 20/08/2015 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Destroyed Slaughtered Birds 20 20 0 20 0 Affected population Sentinel chickens

Outbreak 2 (yl-456) Yuanchang Township, YUNLIN COUNTY Date of start of the outbreak 05/09/2015 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Destroyed Slaughtered Birds 1555 455 455 1100 0 Affected population Breeding geese (yl-456)

Outbreak 3 Dounan Township, YUNLIN COUNTY Date of start of the outbreak 08/09/2015 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Destroyed Slaughtered Birds 1784 20 0 1784 0 Affected population Ducks

Outbreak 4 Dounan Township, YUNLIN COUNTY Date of start of the outbreak 08/09/2015 Outbreak status Continuing (or date resolved not provided) Epidemiological unit Farm Affected animals Species Susceptible Cases Deaths Destroyed Slaughtered Birds 6703 20 0 6703 0 Affected population Ducks

Summary of outbreaks Total outbreaks: 4 Total animals affected Species Susceptible Cases Deaths Destroyed Slaughtered Birds 10062 515 455 9607 0 Outbreak statistics Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost* Birds 5.12% 4.52% 88.35% 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 Abnormal mortalities were observed in one geese breeding farm in Yunlin County. Samples were sent to the National Laboratory (AHRI) for diagnosis. H5N2 subtype HPAI was confirmed by AHRI. During the third round surveillance conducted around the index farm, H5N2 avian influenza virus was further isolated from swab samples taken from two meat-type duck farms. These three farms have been put 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 3 months. A chicken farm located in Changhua County was reported to the OIE as infected by H5N2 HPAI on 7 July 2015. After stamping out operation was conducted by the Local Disease Control Center (LDCC) and cleaning and disinfection was completed, the farmer applied for sentinel chicken test to the LDCC in order to restock the population. After the test, all the 20 sentinel chickens were sent to AHRI for laboratory testing and were confirmed by AHRI as infected by H5N2 HPAI. Cleaning and disinfection were conducted and the farm has been emptied for at least 21 days. Surrounding poultry farms within 3 km radius of the index farm are under intensified surveillance for 3 months.

Control measures Measures applied Movement control inside the country Screening Disinfection / Disinfestation Quarantine Stamping out 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 31/08/2015 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds gene sequencing 09/09/2015 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds gene sequencing 14/09/2015 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds haemagglutination inhibition test (HIT) 31/08/2015 Negative Animal Health Research Institute (AHRI) (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 07/09/2015 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds reverse transcription - polymerase chain reaction (RT-PCR) 14/09/2015 Positive Animal Health Research Institute (AHRI) (National laboratory) Birds virus isolation 31/08/2015 Positive

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

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