OIE: Highly pathogenic avian influenza ,Chinese Taipei

Information received on 02/05/2014 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	15/04/2014
Date of pre-confirmation of the event	23/04/2014
Report date	02/05/2014
Date submitted to OIE	02/05/2014
Reason for notification	Reoccurrence of a listed disease
Date of previous occurrence	28/03/2013
Manifestation of disease	Sub-clinical infection
Causal agent	Highly 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

TAIPEI CITY ( Wanhua District )

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Birds		2	2	0	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Birds	**	**	100.00%	**

* Removed from the susceptible population through death, destruction and/or slaughter;
** Not calculated because of missing information;

Epidemiology

Source of the outbreak(s) or origin of infection

Unknown or inconclusive

Epidemiological comments

An intensive active surveillance was conducted on a wholesale poultry market in Taipei City since April 2014. One hundred serums, 100 fecal swabs and 6 dead chickens were collected for serological and virological tests. The H5N2 subtype of avian influenza virus was isolated in one dead native chicken body sample on 23 April 2014, but it was not in the other samples. By tracing back on 23 April 2014, the original chicken farm in Yunlin County had no chicken remained, but movement control was immediately conducted on the farm. The pathogenicity of the virus was confirmed by the national laboratory as highly pathogenic (>75% mortality of tested chickens) on 2 May 2014. Samples were taken from 8 poultry farms in a 1-km radius around the original farm and confirmed all negative by virus isolation. After thorough cleaning and disinfection of this index farm, sentinel poultry test will be implemented to affirm non-viral activity in the environment. The transaction activities at the wholesale poultry market were stopped for one day to conduct thorough cleaning and disinfection. There were no poultry farms located within the 3-km radius area around the market.

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 ( National laboratory )

Tests and results

Species	Test	Test date	Result
Birds	gene sequencing	25/04/2014	Positive
Birds	inoculation test	02/05/2014	Positive
Birds	virus isolation	23/04/2014	Positive

Future Reporting

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