OIE: Highly pathogenic avian influenza ,Hong Kong (SAR - PRC)

Information received on 29/01/2013 from Dr Thomas Sit, Chief Veterinary Officer / Assistant Director (Inspection & Quarantine), Agriculture, Fisheries and Conservation Department, Hong Kong Special Administrative Region Government, Hong Kong , Hong Kong (SAR - PRC)

Summary

Report type	Immediate notification (Final report)
Date of start of the event	25/01/2013
Date of pre-confirmation of the event	29/01/2013
Report date	29/01/2013
Date submitted to OIE	29/01/2013
Date event resolved	29/01/2013
Reason for notification	Reoccurrence of a listed disease
Date of previous occurrence	26/07/2012
Manifestation of disease	Clinical disease
Causal agent	Highly pathogenic avian influenza virus
Serotype	H5N1
Nature of diagnosis	Laboratory (advanced)
This event pertains to	the whole country

New outbreaks

Summary of outbreaks

Total outbreaks: 1

Outbreak Location

HONG KONG ( Mouse Island children’s playground, Hoi Wing Road, Tuen Mun )

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Black-headed Gull:Laridae (Larus ridibundus)		1	1	0	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Black-headed Gull:Laridae (Larus ridibundus)	**	**	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 surveillance system is in place for all poultry farms, poultry markets and pet bird shops in Hong Kong. The H5N1 infected wild bird was detected in our ongoing surveillance program on wild birds. No spread of disease was evident. The date of closure of the event is the date of end of the outbreak which is the date the bird was found (i.e. 25 January 2013).

Control measures

Measures applied	Screening Disinfection of infected premises/establishment(s) No vaccination No treatment of affected animals
Measures to be applied	No other measures

Diagnostic test results

Laboratory name and type

Tai Lung Veterinary Laboratory, Agriculture, Fisheries & Conservation Department ( National laboratory )

Tests and results

Species	Test	Test date	Result
Black-headed Gull	immunohistochemical test	29/01/2013	Positive
Black-headed Gull	polymerase chain reaction (PCR)	29/01/2013	Positive
Black-headed Gull	virus isolation		Pending

Laboratory name and type

Centre of Influenza Research, School of Public Health, Li Ka Shing Faculty of Medicine, University of Hong Kong ( Regional Reference Laboratory )

Tests and results

Species	Test	Test date	Result
Black-headed Gull	gene sequencing		Pending

Future Reporting

The event is resolved. No more reports will be submitted.

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