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Canada - 1 new outbreak of Bluetongue serotype 13 in beef cattle farm in Ontario (OIE, September 05, 2015)
Canada - 1 new outbreak of Bluetongue serotype 13 in beef cattle farm in Ontario (OIE, September 05, 2015)
Bluetongue,
Canada
Information received on 05/09/2015 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
07/08/2015
Date of confirmation of the event
02/09/2015
Report date
05/09/2015
Date submitted to OIE
05/09/2015
Date event resolved
02/09/2015
Reason for notification
First occurrence of a listed disease
Manifestation of disease
Sub-clinical infection
Causal agent
Bluetongue virus
Serotype
13
Nature of diagnosis
Laboratory (advanced)
This event pertains to
a defined zone within the country
New outbreaks (1)
Outbreak 1 (ONT-2015-001)
Chatham-Kent, ONTARIO
Date of start of the outbreak
07/08/2015
Outbreak status
Resolved (02/09/2015)
Epidemiological unit
Farm
Affected animals
Species
Susceptible
Cases
Deaths
Destroyed
Slaughtered
Cattle
42
3
0
0
1
Affected population
Beef cattle production.
Summary of outbreaks
Total outbreaks: 1
Total animals affected
Species
Susceptible
Cases
Deaths
Destroyed
Slaughtered
Cattle
42
3
0
0
1
Outbreak statistics
Species
Apparent morbidity rate
Apparent mortality rate
Apparent case fatality rate
Proportion susceptible animals lost*
Cattle
7.14%
0.00%
0.00%
2.38%
*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
Sporadic incursions of bluetongue have occurred in the Okanagan Valley, British Columbia in the past. This is the first occurrence of bluetongue serotype 13 in Canada, and the first occurrence of bluetongue outside the Okanagan Valley. Confirmation of this outbreak is based on serology only and is reported in compliance with Chapter 8.3.1.3 of the OIE Terrestrial Animal Health Code. The index animal was detected at slaughter by the national Bovine Serological Surveillance System. Two more seropositive animals were identified through on-farm investigation and testing. No clinical signs were observed in any of the 3 animals. PCR negative results are supportive of a past infection. Because these animals have never left the farm of origin, we conclude that transmission of bluetongue virus has occurred in Ontario for the first time. Bluetongue virus serotype 13 is endemic to the United States of America. The affected beef cattle farm is located in Southwestern Ontario, within 100km from the border with the United States of America. Canada does not implement control measures for bluetongue serotypes 2, 10, 11, 13 and 17. These serotypes are considered endemic in the United States of America.
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 (National laboratory)
Cattle
antibody detection ELISA
28/08/2015
Positive
National Centre for Foreign Animal Disease (National laboratory)
Cattle
polymerase chain reaction (PCR)
02/09/2015
Negative
National Centre for Foreign Animal Disease (National laboratory)
Cattle
seroneutralization test (SNT)
02/09/2015
Positive
Future Reporting
The event is resolved. No more reports will be submitted.