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2022-8-19 6:34:49


OIE: Highly pathogenic avian influenza ,Chinese Taipei
submited by kickingbird at Jan, 14, 2015 8:2 AM from OIE

Information received on 12/01/2015 from Dr Ping-Cheng Yang, Vice President, Agriculture Technology Research Institute, Council of Agriculture, Hsinchu City, Chinese Taipei

Summary

Report type

Immediate notification

Date of start of the event

07/01/2015

Date of pre-confirmation of the event

11/01/2015

Report date

12/01/2015

Date submitted to OIE

12/01/2015

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

New outbreaks

Summary of outbreaks

Total outbreaks: 5

Outbreak Location

  • YUNLIN COUNTY ( Sihu Township Kouhu Township Kouhu Township Sihu Township )
  • PINGTUNG COUNTY ( Wandan Township )

Total animals affected

Species

Susceptible

Cases

Deaths

Destroyed

Slaughtered

Birds

26290

10004

9883

Outbreak statistics

Species

Apparent morbidity rate

Apparent mortality rate

Apparent case fatality rate

Proportion susceptible animals lost*

Birds

38.05%

37.59%

98.79%

**


* 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 in 4 goose farms in Yun-Lin County and an acute egg drop syndrome in a layer duck farm in Ping-Tung County were noticed early January 2015. Local disease control center staff went to these farms to conduct movement restrictions and clinical inspection and then sent dead geese and layer ducks samples to the National Laboratory for diagnosis. Specific RNA product of avian influenza virus was detected and subtyped as H5N2 by RT-PCR. Highly pathogenic avian influenza strain was confirmed by the National Laboratory based on sequencing analysis of HA0 cleavage site. It is worth noting that H and N genes of these isolates are different from the H5N2 strains previously isolated in Taiwan. The homology of H5 between the isolates from these infected farms and the South Korea 2014 H5N8 strain is near 99%. The homology of N2 between the isolates from these infected farms and the China 2011 H5N2 strain is 96%. This H5N2 strain is obviously novel to Taiwan. All the geese and ducks on the infected farm will be culled. The actual number of culled geese and ducks will be available when stamping out will finish and be reported in the next follow-up report. Thorough cleaning and disinfection will be conducted after stamping out operation. Surrounding poultry farms within a 3 km radius of the infected farm are under intensified surveillance for 3 months.

Control measures

Measures applied

  • Stamping out
  • Quarantine
  • Movement control inside the country
  • Screening
  • Zoning
  • Disinfection of infected premises/establishment(s)
  • Vaccination prohibited
  • No treatment of affected animals

Measures to be applied

  • No other measures

Diagnostic test results

Laboratory name and type

Animal Health Research Institute (AHRI) ( National laboratory )

Tests and results

Species

Test

Test date

Result

Birds

gene sequencing

11/01/2015

Positive

Birds

reverse transcription - polymerase chain reaction (RT-PCR)

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