Highly pathogenic avian influenza, Laos (OIE, May 14 2010, edited)

[Giuseppe]

Highly pathogenic avian influenza, Laos (OIE, May 14 2010, edited)

[Source: OIE, Full PDF Document (LINK). Edited.]

Highly pathogenic avian influenza, Laos

Information received on 14/05/2010 from Dr Khambounheuang Bounkhouang , Directeur G?n?ral, D?partement de l'Elevage et des P?ches , Minist?re de l'Agriculture et des For?ts , Vientiane, Laos

• Summary
  • Report type Immediate notification
  • Start date 27/04/2010
  • Date of first confirmation of the event 06/05/2010
  • Report date 14/05/2010
  • Date submitted to OIE 14/05/2010
  • Reason for notification Reoccurrence of a listed disease
  • Date of previous occurrence 04/04/2009
  • Manifestation of disease Clinical disease
  • Causal agent Highly pathogenic avian influenza virus
  • Serotype H5N1
  • Nature of diagnosis Clinical, Laboratory (basic), Necropsy
  • This event pertains to the whole country

• New outbreaks
  • Summary of outbreaks
    • Total outbreaks: 1
      • Location(s) - VIENTIANE CAPITAL (Latkhouay Farm, Xaythany )
        • Total animals affected: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
          • Birds - 1004 - 44 - 44 - 960 - 0
        • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
          • Birds - 4.38% - 4.38% - 100.00% - 100.00%
          • * Removed from the susceptible population through death, destruction and/or slaughter

• Epidemiology
  • Source of the outbreak(s) or origin of infection
    • Unknown or inconclusive

• Epidemiological comments
  • The layers started to show clinical signs on 27 April 2010 and from 28 to 29 April 2010 two layers died. The first two dead poultry were submitted to the National Avian Influenza Laboratory. At the laboratory, necropsy of the two whole carcasses was performed as well as rapid test to detect influenza A and H5; results were slightly positive for avian influenza. Movement control measures of poultry and poultry products were effective.
  • From 1 to 5 May 2010, the mortality of the poultry increased drastically in the farm and the farmer sent some more whole carcasses to the laboratory. The samples were tested using rapid test and were positive for influenza A and H5. On 6 May 2010, the samples were retested for confirmation using real-time PCR and results were positive for highly pathogenic avian influenza H5N1.
  • Actions for containing the spread of the infection were applied such as culling of infected and potentially infected poultry and disinfection of the premises; both were completed on 7 May 2010. Active and passive surveillances are on-going within 5 km radius around the infected farm. In addition, movement control is also effective.

• Control measures
  • Measures applied
    • Stamping out
    • Movement control inside the country
    • Screening
    • Zoning
    • Disinfection of infected premises/establishment(s)
    • Vaccination prohibited
    • No treatment of affected animals
  • Measures to be applied
    • No other measures

• Diagnostic test results
  • Laboratory name and type Avian Influenza Laboratory at the National Animal Health Centre (National laboratory)
    • Tests and results: Species - Test - Test date - Result
      • Birds - real-time PCR - 06/05/2010 - Positive

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

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