Bluetongue,
Canada
Information received on 28/11/2013 from Dr Martine Dubuc, OIE Delegate for Canada, Chief Food Safety Officer Vice-President, Science Branch, Health Ministry, Canadian Food Inspection Agency, Ottawa, Canada
Summary
Report type Immediate notification (Final report)
Date of start of the event 16/10/2013
Date of confirmation of the event 20/11/2013
Report date 28/11/2013
Date submitted to OIE 28/11/2013
Date event resolved 20/11/2013
Reason for notification Recurrence of a listed disease
Date of previous occurrence 1988
Manifestation of disease Sub-clinical infection
Causal agent Bluetongue virus
Serotype 11
Nature of diagnosis Laboratory (advanced)
This event pertains to a defined zone within the country
New outbreaks (2)
Outbreak 1 (2013-BC-002) Penticton, British Columbia
Date of start of the outbreak 16/10/2013
Outbreak status Resolved (20/11/2013)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 51 2 0 0 0
Affected population Beef cattle bluetongue sentinel herd located in the Okanagan Valley, British Columbia (cow-calf)
Outbreak 2 (2013-BT-001) Oliver, British Columbia
Date of start of the outbreak 16/10/2013
Outbreak status Resolved (20/11/2013)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 200 2 0 0 0
Affected population Beef cattle bluetongue sentinel herd located in the Okanagan Valley, British Columbia (feedlot)
Summary of outbreaks Total outbreaks: 2
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Cattle 251 4 0 0 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Cattle 1.59% 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
  • Previous outbreaks in the same area in the past were likely associated with natural incursions of infected Culicoides from the United States of America
Epidemiological comments The two current infected premises reported today were detected as part of the Okanagan zone BTV sentinel herds programme established in 1989. No clinical signs were observed. This is the 4th occurrence of BTV serotype 11 (North American lineage) in the Okanagan. BTV 11 is one of the 5 serotypes that are known to be present in the United States of America (BTV-2, 10, 11, 13, 17). Canada’s control measure of compulsory cattle identification and traceability for Okanagan cattle continues to apply from 1988. Additional control measures would be implemented for any serotype of bluetongue other than BTV 2, 10, 11, 13 and 17. The current climate conditions in Canada are not favourable for bluetongue transmission. Sporadic incursions of bluetongue have occurred in the Okanagan Valley in British Columbia, Canada, since surveillance started in 1969. National serological surveys have been conducted periodically in the Canadian domestic cattle population and the bluetongue virus has never been detected in Canada outside the Okanagan Valley.
Control measures
Measures applied
  • Vaccination prohibited
  • No treatment of affected animals
Measures to be applied
  • No other measures
Diagnostic test results
Laboratory name and type Species Test Test date Result
National Centre for Foreign Animal Disease - CFIA Winnipeg (National laboratory) Cattle seroneutralization test (SNT) 20/11/2013 Positive
National Centre for Foreign Animal Disease - CFIA Winnipeg (National laboratory) Cattle Solid-phase blocking ELISA 25/10/2013 Positive
National Centre for Foreign Animal Disease - CFIA Winnipeg (National laboratory) Cattle Solid-phase competitive ELISA 25/10/2013 Positive
National Centre for Foreign Animal Disease - CFIA Winnipeg (National laboratory) Cattle virus isolation 20/11/2013 Positive
Future Reporting
The event is resolved. No more reports will be submitted.
Map of outbreak locations