OIE: Low pathogenic avian influenza (poultry) ,Chinese Taipei

Information received on 19/05/2014 from Dr Ping-Cheng Yang, Director, Animal Technology Institute Ta?wan, Council of Agriculture, Ta?wan, Chinese Taipei

Summary

Report type	Immediate notification
Date of start of the event	21/04/2014
Date of pre-confirmation of the event	29/04/2014
Report date	19/05/2014
Date submitted to OIE	19/05/2014
Reason for notification	Reoccurrence of a listed disease
Date of previous occurrence	18/02/2014
Manifestation of disease	Sub-clinical infection
Causal agent	Low pathogenic avian influenza virus
Serotype	H5N2
Nature of diagnosis	Laboratory (advanced)
This event pertains to	a defined zone within the country

New outbreaks

Summary of outbreaks

Total outbreaks: 1

Outbreak Location

YUNLIN COUNTY ( Erlun Township )

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Birds	4184	20	0	0	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Birds	0.48%	0.00%	0.00%	0.00%

* 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

The H5N2 subtype virus was isolated by active surveillance and confirmed by national laboratory on 29 April 2014. Antibodies were also detected on collected serum samples. Movement restriction was implemented on the infected farm on 29 April 2014. Clinical health investigation on the affected farm showed that the breeders were in healthy condition without abnormal mortality and egg production.
The pathogenicity of the virus has been subsequently confirmed by national laboratory as low pathogenic (less than 75% mortality of the tested chickens) on 19 May 2014. The clinical investigation and surveillance of surrounding poultry farms are in progress.

Control measures

Measures applied	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 ( National laboratory )

Tests and results

Species	Test	Test date	Result
Birds	gene sequencing	01/05/2014	Negative
Birds	haemagglutination inhibition test (HIT)	01/05/2014	Positive
Birds	virus isolation	29/04/2014	Positive

Future Reporting

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