Highly pathogenic avian influenza, Hong Kong (SAR - PRC) (OIE, Decmber 19 2011): a Black-Headed Gull positive for A(H5N1)

[Giuseppe]

[Source: OIE, full page: (LINK). Edited.]


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


Information received on 19/12/2011 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)
  • Start date 13/12/2011
  • Date of first confirmation of the event 19/12/2011
  • Report date 19/12/2011
  • Date submitted to OIE 19/12/2011
  • Date event resolved 13/12/2011
  • Reason for notification Reoccurrence of a listed disease
  • Date of previous occurrence 01/03/2011
  • 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
• New outbreaks
  • Outbreak 1 7 - Tai Yuk Road, Yuen Long, HONG KONG
    • Date of start of the outbreak 13/12/2011
    • Outbreak status Resolved (13/12/2011)
    • Epidemiological unit Not applicable
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Wild species - ? ? 1 ? 1 ? 0 ? 0
      • Affected Population A Black-headed Gull (Chroicocephalus ridibundus) was collected on 13 December 2011 at 7 Tai Yuk Road, Yuen Long. The Black-headed Gull is a common winter visitor in Hong Kong.
• Summary of outbreaks
  • Total outbreaks: 1
  • 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, pet bird shops in Hong Kong.
  • The H5N1 infected wild bird was detected in the framework of the ongoing surveillance program on wild birds.
  • No spread of disease was evident.
  • As this was a wild bird case, the date of event ended is the same as the date the bird was found (i.e. 13 December 2011).
  • Important note by the OIE Animal Health Information Department: According to Chapter 10.4 on avian influenza of the OIE Terrestrial Animal Health Code (2011), the notification of this outbreak does not change the HPAI free status of Hong Kong and should not affect trade of poultry and their products since the bird involved in this outbreak do not fall within the OIE definition of poultry.
• 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
      • Wild species - immunohistochemical test - 15/12/2011 ? Positive
      • Wild species - polymerase chain reaction (PCR) - 15/12/2011 ? Positive
      • Wild species - virus isolation - 19/12/2011 ? Positive
  • Laboratory name and type Department of Microbiology, 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 resolved. No more reports will be submitted.

(?)
-
-------