Highly pathogenic influenza A viruses (infection with) (non-poultry including wild birds),
Hong Kong (SAR - PRC)
Information received on 10/02/2018 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
Date of start of the event 07/02/2018
Date of confirmation of the event 09/02/2018
Report date 09/02/2018
Date submitted to OIE 10/02/2018
Reason for notification Recurrence of a listed disease
Date of previous occurrence 21/12/2017
Manifestation of disease Clinical disease
Causal agent Highly pathogenic influenza A virus
Serotype H5N6
Nature of diagnosis Laboratory (advanced)
This event pertains to the whole country
New outbreaks (1)
Outbreak 1 Lau Fau Shan, Tin Shui Wai, Yuen Long , HONG KONG
Date of start of the outbreak 07/02/2018
Outbreak status Resolved (07/02/2018)
Epidemiological unit Not applicable
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Black-headed Gull:Larus ridibundus(Laridae) 1 1 0 0
Affected population A dead black-headed gull was collected on 7 February 2018 in Lau Fau Shan, Tin Shui Wai. The species is an abundant winter visitor in Hong Kong.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Black-headed Gull:Larus ridibundus(Laridae) 1 1 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Black-headed Gull:Larus ridibundus(Laridae) ** ** 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 H5N6 infected wild bird was detected in the ongoing national surveillance program on wild birds. There are two poultry farms located within three kilometres of where the bird was found. No abnormalities or signs of avian influenza were found in the two poultry farms. The Hong Kong Wetland Park is located within three kilometres of where the bird was found. No spread of disease was evident. The date of end of the outbreak is the same as the date the bird was found (7 February 2018).
Control measures
Measures applied
  • Screening
  • Disinfection
  • 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 Species Test Test date Result
Tai Lung Veterinary Laboratory, Agriculture, Fisheries & Conservation Department (National laboratory) Black-headed Gull immunohistochemical test 08/02/2018 Positive
Tai Lung Veterinary Laboratory, Agriculture, Fisheries & Conservation Department (National laboratory) Black-headed Gull real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 08/02/2018 Positive
Tai Lung Veterinary Laboratory, Agriculture, Fisheries & Conservation Department (National laboratory) Black-headed Gull virus isolation 09/02/2018 Positive
Centre of Influenza Research, School of Public Health, Li Ka Shing Faculty of Medicine, University of Hong Kong (Regional Reference Laboratory) Black-headed Gull gene sequencing Pending
National Influenza Centre, Centre for Health Protection, Department of Health (Regional Reference Laboratory) Black-headed Gull gene sequencing Pending
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations