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

Information received on 05/12/2016 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	25/11/2016
Date of confirmation of the event	05/12/2016
Report date	05/12/2016
Date submitted to OIE	06/12/2016
Date event resolved	25/11/2016
Reason for notification	Reoccurrence of a listed disease
Date of previous occurrence	14/02/2016
Manifestation of disease	Sub-clinical infection
Causal agent	Highly pathogenic avian influenza virus
Serotype	H5N6
Nature of diagnosis	Laboratory (advanced)
This event pertains to	the whole country

New outbreaks

Summary of outbreaks

Total outbreaks: 1

Outbreak Location

HONG KONG ( Mai Po, Yuen Long )

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Northern Pintail:Anatidae (Anas acuta)		3	0	0	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Northern Pintail:Anatidae (Anas acuta)	**	**	0.00%	**

* 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 avian influenza virus, including screening, at Mai Po Nature Reserve in Hong Kong. Three environmental samples were collected for the routine academic surveillance study by University of Hong Kong on 25 November 2016 and subsequently tested positive for H5N6. Additional sequencing results showed that these samples contain the DNA of Anas acuta (Northern pintail). The date of the end of the outbreak is the same as the date the samples were taken (25 November 2016).

Control measures

Measures applied	Screening Vaccination permitted (if a vaccine exists) No treatment of affected animals
Measures to be applied	No other measures

Diagnostic test results

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
Northern Pintail	gene sequencing	05/12/2016	Positive
Northern Pintail	virus isolation	28/11/2016	Positive

Future Reporting

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