Highly pathogenic avian influenza, Hong Kong (SAR - PRC): A Little Egret tested positive for H5N1

[Giuseppe]

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


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


Information received on 20/01/2012 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. 4
  • Start date 17/12/2011
  • Date of first confirmation of the event 20/12/2011
  • Report date 20/01/2012
  • Date submitted to OIE 20/01/2012
  • 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)
• New outbreaks
  • Outbreak 1 Lot 1520RP, DD123, Nam Sang Wai, Yuen Long, HONG KONG
    • Date of start of the outbreak 12/01/2012
    • Outbreak status Resolved (12/01/2012)
    • Epidemiological unit Not applicable
    • Affected animals: Species ? Susceptible ? Cases ? Deaths ? Destroyed ? Slaughtered
      • Wild species - ? ? 1 ? 1 ? 0 ? 0
      • Affected Population A little egret (Egretta garzetta) was collected on 12 January 2012 at Yuen Long. The little egret is a common resident 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 and pet bird shops in Hong Kong.
  • The H5N1 infected wild birds were detected in ongoing surveillance programme on wild birds.
  • The dates of the outbreaks concerning wild birds ended are the same as the dates the birds were collected (i.e. 17 December 2011, 30 December 2011, 1 January 2012 and 12 January 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 (National laboratory)
    • Tests and results: Species ? Test - Test date ? Result
      • Wild species - immunohistochemical test - 14/01/2012 ? Positive
      • Wild species - polymerase chain reaction (PCR) - 14/01/2012 ? Positive
  • Laboratory name and type Tai Lung Veterinary Laboratory, Agriculture, Fisheries & Conservation Department (National laboratory)
    • Tests and results: Species ? Test - Test date ? Result
      • Wild species - virus isolation - 17/01/2012 ? Positive
  • Laboratory name and type Department of Microbiology, University of Hong Kong (Regional Reference Laboratory)
    • Tests and results: Species ? Test ? Test date - Result
      • Wild species - gene sequencing - 20/01/2012 ? Positive
• Future Reporting
  • The event is continuing. Weekly follow-up reports will be submitted.

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