Pandemic influenza H1N1 (2009), Japan (OIE, WAHID Interface, 1/20/10, edited)

[Giuseppe]

Pandemic influenza H1N1 (2009), Japan (OIE, WAHID Interface, 1/20/10, edited)

[Source Full PDF Document: LINK. EDITED.]

Pandemic influenza H1N1 (2009), Japan

Information received on 20/01/2010 from Dr Toshiro Kawashima, CVO, Animal Health Division, Ministry of Agriculture, Forestry and Fisheries, Tokyo , Japan

• Summary
  • Report type Immediate notification
  • Start date 12/01/2010
  • Date of first confirmation of the event 12/01/2010
  • Report date 20/01/2010
  • Date submitted to OIE 20/01/2010
  • Reason for notification Emerging disease
  • Morbidity 6.7 %
  • Mortality 0 %
  • Zoonotic impact It affects also humans
  • Causal agent Pandemic influenza H1N1 (2009)

• New outbreaks
  • Summary of outbreaks
    • Total outbreaks: 1
      • Location(s) - YAMAGATA (Shonai area)
      • Total animals affected: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
        • Swine - 2445 - 164 - 0 - 0 - 0

• Outbreak statistics
  • Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
    • Swine - 6.71% - 0.00% - 0.00% - 0.00%
    • * 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
  • A worker found the animals, which showed poor appetite, fever and cough in the farm occasionally, and reported them to the Livestock Hygiene Service Centre in Yamagata prefecture on 12 January 2010.
  • Ten animals which showed clinical signs were sampled.
  • 5 of 10 samples were found to be influenza A positive by rapid test on 12 January 2010 and 7 of 10 samples were influenza A positive by PCR on 13 January 2010.
  • There were some workers who had been infected with influenza A virus before the outbreak.
  • On 20 January 2010, the virus strains detected from 4 samples were confirmed as pandemic influenza H1N1 2009 by the National Institute of Animal Health (NIAH).
  • The affected farm is being under voluntary movement restraint.
  • Epidemiological investigation is continuing.

• Control measures
  • Measures applied
    • Movement control inside the country
    • No vaccination
    • No treatment of affected animals
  • Measures to be applied
    • Screening

• Diagnostic test results
  • Laboratory name and type Livestock Hygiene Service Centre, Yamagata prefecture (Local laboratory)
    • Tests and results: Species - Test - Test date - Result
      • Swine - pathogen isolation on cell culture - 17/01/2010 - Positive
      • Swine - polymerase chain reaction (PCR) - 13/01/2010 - Positive
      • Swine - rapid tests - 12/01/2010 - Positive
  • Laboratory name and type National Institute of Animal Health (National laboratory)
    • Tests and results: Species - Test - Test date - Result
      • Swine - gene sequencing - 20/01/2010 - Positive

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

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