OIE: Highly pathogenic avian influenza ,Chinese Taipei

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)