OIE: Highly pathogenic avian influenza, Hong Kong (SAR

OIE: Highly pathogenic avian influenza, Hong Kong (SAR - PRC)_Follow-up report No. 10
submited by kickingbird at Mar, 3, 2012 8:10 AM from OIE

Information received on 02/03/2012 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	Follow-up report No. 10
Start date	17/12/2011
Date of first confirmation of the event	20/12/2011
Report date	01/03/2012
Date submitted to OIE	02/03/2012
Reason for notification	Reoccurrence of a listed disease
Date of previous occurrence	13/12/2011
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
Related reports	Immediate notification (23/12/2011) Follow-up report No. 1 (30/12/2011) Follow-up report No. 2 (06/01/2012) Follow-up report No. 3 (12/01/2012) Follow-up report No. 4 (20/01/2012) Follow-up report No. 5 (27/01/2012) Follow-up report No. 6 (03/02/2012) Follow-up report No. 7 (09/02/2012) Follow-up report No. 8 (17/02/2012) Follow-up report No. 9 (24/02/2012) Follow-up report No. 10 (01/03/2012)

New outbreaks

Outbreak 1

131 Argyle Street, Mongkok, HONG KONG

Date of start of the outbreak

24/02/2012

Outbreak status

Resolved (24/02/2012)

Epidemiological unit

Not applicable

Affected animals

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Wild species		1	1	0	0

Affected Population

A Crested Goshawk (Accipiter trivirgatus) was collected on 24 February 2012 at Mongkok. The Crested Goshawk is an uncommon local resident in Hong Kong.

Outbreak 2

76 Hing Lung Back Street, Cheung Chau, HONG KONG

Date of start of the outbreak

25/02/2012

Outbreak status

Resolved (25/02/2012)

Epidemiological unit

Not applicable

Affected animals

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Wild species		1	1	0	0

Affected Population

An Oriental Magpie Robin (Copsychus saularis) was collected on 25 February 2012 at Cheung Chau. The Oriental Magpie Robin is a common local resident in Hong Kong.

Outbreak 3

80 Hok Loo Lane, Cheung Chau, HONG KONG

Date of start of the outbreak

27/02/2012

Outbreak status

Resolved (27/02/2012)

Epidemiological unit

Not applicable

Affected animals

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Wild species		1	1	0	0

Affected Population

An Oriental Magpie Robin (Copsychus saularis) was collected on 27 February 2012 at Cheung Chau. The Oriental Magpie Robin is a common local resident in Hong Kong.

Summary of outbreaks

Total outbreaks: 3

Total animals affected

Species	Susceptible	Cases	Deaths	Destroyed	Slaughtered
Wild species		3	3	0	0

Outbreak statistics

Species	Apparent morbidity rate	Apparent mortality rate	Apparent case fatality rate	Proportion susceptible animals lost*
Wild species	**	**	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 birds and goose carcass from unknown source were detected in ongoing surveillance programme on wild birds. The dates of the outbreaks are the same as the dates the birds were collected (i.e. 17 December 2011, 30 December 2011, 1 January 2012, 12 January 2012, 20 January 2012 , 30 January 2012 , 6 February 2012, 7 February 2012, 8 February 2012, 24 February 2012, 25 February 2012 and 27 February 2012 respectively).
A total of 19,451 poultry, including 15,569 chickens, 810 pigeons, 1,950 pheasants and 1,122 silky fowls were culled in the Cheung Sha Wan Temporary Wholesale Poultry Market on 21 December 2011. The Wholesale Poultry Market was closed. Importation of live poultry and movement of poultry in local farms is banned for 21 days.
Surveillance and monitoring of local chicken farms has been stepped up. No H5 virus was detected in samples taken from the 30 chicken farms in Hong Kong. The Wholesale Poultry Market was reopened on 12 January 2012.

Control measures

Measures applied	Stamping out Quarantine Movement control inside the country Screening Zoning Disinfection of infected premises/establishment(s) Dipping / Spraying 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
Wild species	immunohistochemical test	28/02/2012	Positive
Wild species	immunohistochemical test	29/02/2012	Positive
Wild species	polymerase chain reaction (PCR)	28/02/2012	Positive
Wild species	polymerase chain reaction (PCR)	29/02/2012	Positive
Wild species	virus isolation		Pending

Laboratory name and type

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

Tests and results

Species	Test	Test date	Result
Wild species	gene sequencing		Pending

Future Reporting

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

See Also:

http://web.oie.int/wahis/public.php?page=single_report&pop=1&reportid=11691

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