Pandemic Influenza H1N1 (2009), Japan (WAHID Interface - OIE World Animal Health Information Database, 10/21/09, edited)

[Giuseppe]

Pandemic Influenza H1N1 (2009), Japan (WAHID Interface - OIE World Animal Health Information Database, 10/21/09, edited)

Pandemic Influenza H1N1 (2009), Japan

Information received on 21/10/2009 from Dr Toshiro Kawashima, CVO, Animal Health Division, Ministry of Agriculture, Forestry and Fisheries, Tokyo , Japan

• Summary
  • Report type Immediate notification
  • Start date 02/10/2009
  • Date of first confirmation of the event 21/10/2009
  • Report date 21/10/2009
  • Date submitted to OIE 21/10/2009
  • Reason for notification Emerging disease
  • Morbidity 1 %
  • Mortality 0 %
  • Zoonotic impact No workers in the farm have contracted influenza-like illness during at least one month prior to this incident.
  • Causal agent Pandemic Influenza H1N1 2009
  • Serotype Other
  • This event pertains to the whole country

• New outbreaks
  • Outbreak 1 - Osaka area, OSAKA
    • Date of start of the outbreak 02/10/2009
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
      • Swine - 1000 - 10 - 0 - 0 - 0
      • Affected Population Integrated farrow-to-finish farm with approximately 100 breeding sows and a total of 1,000 pigs.

• Summary of outbreaks
  • Total outbreaks: 1
  • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
    • Swine - 1.00% - 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
    • Under investigation

• Epidemiological comments
  • This is the first infection of Pandemic Influenza H1N1 2009 in swine in Japan. The infection was detected through surveillance conducted by prefectural veterinary authority. The virus was isolated from a pool of 10 nasal swabs directly collected randomly from pigs without clinical signs on 2 October 2009. The subtype H1 was confirmed by National Institute of Animal Health (NIAH) on 20 October 2009 while the subtype N1 was confirmed on 21 October 2009. The affected farm is being under voluntary movement restraint. No abnormalities are observed in pigs within a 10km radius around the affected farm. Epidemiological investigations are 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 in Osaka prefecture (Local laboratory)
    • Tests and results: Species - Test - Test date - Result
      • Swine - haemagglutination inhibition test (HIT) - 16/10/2009 - Positive
      • Swine - polymerase chain reaction (PCR) - 16/10/2009 - Positive
  • Laboratory name and type National Institute of Animal Health (National laboratory)
    • Tests and results: Species - Test - Test date - Result
      • Swine - gene sequencing - 20/10/2009 - Positive
      • Swine - gene sequencing - 21/10/2009 - Positive
      • Swine - polymerase chain reaction (PCR) - 19/10/2009 - Positive

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

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<cite cite="http://www.oie.int/wahis/public.php?page=single_report&pop=1&reportid=8554" >WAHID Interface - OIE World Animal Health Information Database</cite>