Low pathogenic avian influenza (poultry), Canada (WAHID Interface - OIE World Animal Health Information Database, 11/25/10, edited)

[Giuseppe]

Low pathogenic avian influenza (poultry), Canada (WAHID Interface - OIE World Animal Health Information Database, 11/25/10, edited)


[Source: OIE, full page: <cite cite="http://www.oie.int/wahis/public.php?page=single_report&pop=1&reportid=9973" >WAHID Interface - OIE World Animal Health Information Database</cite>. Edited.]

Low pathogenic avian influenza (poultry), Canada

Information received on 25/11/2010 from Dr Brian Evans, Chief Food Safety Officer/Chief Veterinary Officer, Office of the President, Canadian Food Inspection Agency, OTTAWA, Canada

• Summary
  • Report type Immediate notification
  • Start date 17/11/2010
  • Date of first confirmation of the event 23/11/2010
  • Report date 24/11/2010
  • Date submitted to OIE 25/11/2010
  • Reason for notification Reoccurrence of a listed disease
  • Date of previous occurrence 11/03/2009
  • Manifestation of disease Clinical disease
  • Causal agent Low pathogenic avian influenza virus
  • Serotype H5N2
  • Nature of diagnosis Laboratory (advanced)
  • This event pertains to a defined zone within the country

• New outbreaks
  • Outbreak 1 (NAI-2010-MB-001) - Rockwood municipality, MANITOBA
    • Date of start of the outbreak 17/11/2010
    • Outbreak status Continuing (or date resolved not provided)
    • Epidemiological unit Farm
    • Affected animals: Species - Susceptible - Cases - Deaths - Destroyed - Slaughtered
      • Birds - 7400 - 3000 - 0 - 0 - 0
    • Affected Population:
      • Turkey breeders farm, with four barns on site.
      • Barn 1 is empty, barn 2 contains 600 toms (approx.), barn 3 contains 3,000 hens (approx.) and barn 4 contains 3,800 hens (approx.).
      • The hens in both barn 3 and 4 are 44 weeks old and were lethargic with a 45% decrease in egg production but the egg production has improved since the start of the event.
      • No respiratory disease was observed.
      • The mortality in the flock has not increased.

• Summary of outbreaks
  • Total outbreaks: 1
  • Outbreak statistics: Species - Apparent morbidity rate - Apparent mortality rate - Apparent case fatality rate - Proportion susceptible animals lost*
    • Birds - 40.54% - 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
  • This is the first outbreak of Notifiable Avian Influenza (NAI) detected in the province of Manitoba.
  • The farm has been quarantined by the Canadian Food Inspection Agency (CFIA) and investigation will be conducted in compliance with the Canada's Notifiable Avian Influenza Hazard Specific Plan.
  • A stamping out policy will be applied.
  • Preliminary results from the National Center for Foreign Animal Diseases in Winnipeg indicate the presence of a H5N2 subtype avian influenza virus (PCR).
  • Sequence analysis of the PCR products indicates that the cleavage site is consistent with low pathogenic avian influenza virus H5.
  • Closest matches (99% identity) in Genbank are to North American H5N2 viruses from wild birds.
  • Virus isolation is underway and additional testing is to come, including the intravenous pathogenicity index test.
  • NAI surveillance has been in place in domestic poultry in Canada for many years and this outbreak is limited to the province of Manitoba.
  • Note by the OIE Animal Health Information Department:
    • H5 and H7 avian influenza in its low pathogenic form in poultry is a notifiable disease as per Chapter 10.4. on avian influenza of the Terrestrial Animal Health Code (2010).

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

• Diagnostic test results
  • Laboratory name and type: Manitoba Agriculture, Food and Rural Initiatives Veterinary Diagnostic Services (Local laboratory)
    • Tests and results: Species - Test - Test date - Result
      • Birds - polymerase chain reaction (PCR) - 23/11/2010 - Positive
  • Laboratory name and type CFIA - National Center for Foreign Animal Diseases (National laboratory)
    • Tests and results: Species - Test - Test date - Result
      • Birds - nucleotide sequencing - 24/11/2010 - Positive
      • Birds - real-time PCR - 24/11/2010 - Positive

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

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