Highly pathogenic avian influenza,
Canada
Information received on 28/09/2007 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
Date of start of the event 23/09/2007
Date of confirmation of the event 27/09/2007
Report date 28/09/2007
Date submitted to OIE 28/09/2007
Date event resolved 18/01/2008
Reason for notification Recurrence of a listed disease
Date of previous occurrence 2004
Manifestation of disease Clinical disease
Causal agent Avian influenza virus
Serotype H7N3
Nature of diagnosis Clinical, Laboratory (basic), Laboratory (advanced)
This event pertains to the whole country
Related reports Immediate notification (28/09/2007)
Follow-up report No. 1 (05/10/2007)
Follow-up report No. 2 (18/10/2007)
Follow-up report No. 3 (31/10/2007)
Follow-up report No. 4 (17/04/2008)
New outbreaks (1)
Outbreak 1 (CAN-AI-2007-01) Regina Beach, Regina, SASKATCHEWAN
Date of start of the outbreak 23/09/2007
Outbreak status Resolved (18/01/2008)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 49100 540 540 48560 0
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Destroyed Slaughtered
Birds 49100 540 540 48560 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Birds 1.10% 1.10% 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
  • Contact with wild species suspected but not confirmed
Epidemiological comments The 100 rooster had been moved from the affected barn into the 52 week-old breeder flock two weeks previously. Additionally, 160 rooster were moved to the 29 week-old breeder flock on September 17. No signs of illness have been noticed in any of the breeder barns; however, the 29 week-old breeder flock has not performed well; they did not peck as expected and production is not as good as anticipated. On September 25, ancillary genetic results indicated the presence of an H7N3 virus in swab and tissue samples taken from the rooster barn. As of September 26, further test results indicate that birds in that barn were exposed to the virus several days prior to the findings as serology titers are demonstrated towards the virus. H7N3 active infection was further demonstrated with the presence of live virus in tissues from dead birds and swabs. Initial virus molecular pathotyping indicate that the virus has a high pathogenic molecular pattern. All samples tested to date from birds located in the other barns on the same premise do not indicate the presence of avian influenza viruses. Canadian Food Inspection Agency (CFIA) officials continue to proceed with the investigation according to the Notifiable Avian Influenza - Hazard Specific Plan (NAI-HSP). CFIA will apply restrictions on the movement of poultry and poultry products within three kilometres of the infected premises. As an additional safeguard, any poultry operations within ten kilometres of the infected premises will be closely and regularly monitored for signs of illness.
Control measures
Measures applied
  • Movement control inside the country
  • Screening
  • Quarantine
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • Disinfection / Disinfestation
  • Stamping out
Diagnostic test results
Laboratory name and type Species Test Test date Result
CFIA National Center Foreign Animal Disease, Winnipeg (National laboratory) Birds competitive ELISA (c-ELISA) 24/09/2007 Positive
CFIA National Center Foreign Animal Disease, Winnipeg (National laboratory) Birds neuraminidase inhibition assay 25/09/2007 Positive
CFIA National Center Foreign Animal Disease, Winnipeg (National laboratory) Birds polymerase chain reaction (PCR) 25/09/2007 Positive
CFIA National Center Foreign Animal Disease, Winnipeg (National laboratory) Birds polymerase chain reaction (PCR) 26/09/2007 Positive
CFIA NAtional Center Foreign Animal Disease, Winnipeg (National laboratory) Birds haemagglutination inhibition test (HIT) 26/09/2007 Positive
CFIA NAtional Center Foreign Animal Disease, Winnipeg (National laboratory) Birds virus isolation 26/09/2007 Positive
CFIA NAtional Center Foreign Animal Disease, Winnipeg (National laboratory) Birds virus sequencing 27/09/2007 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations