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Risk Assessment on
Bovine Brucellosis and Tuberculosis in Wood Buffalo National Park and
Area
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WBNP
1999 Risk Assessment Report
(PDF = 1004KB)
CFIA
Risk Assessment
(PDF = 1280 KB)
Bison in and around
Wood Buffalo National Park (WBNP) are infected with the organisms
causing
bovine brucellosis (Brucella abortus) and
tuberculosis (Mycobacterium
bovis). The continued presence of these diseases in bison in and
around WBNP poses an undefined risk to three at-risk groups:
- commercial
cattle in the Fort Vermillion area
- commercial
captive bison herds in northern Alberta and northeast British
Columbia
- disease-free,
free-ranging bison herds – i.e., the
Mackenzie and Hay Zama
bison populations
In March 1996,
the Canadian Bison Association requested a formal risk assessment from
the Canadian Food Inspection Agency (CFIA) to determine the risk of
infection with tuberculosis and/or brucellosis to cattle, and
disease-free captive and free-ranging bison. The Animals, Plant and Food
Health Risk Assessment Network (APFRAN) of the Canadian Food Inspection
Agency completed a risk assessment in January 1999.
The risk
assessment was undertaken to quantify the risk to these three at-risk
groups. A series of conditional probabilities related to transmission
were developed and the economic consequences associated with
infection/transmission assessed.
Data used in the
risk assessment included radio telemetry data collected over a
three-year period from bison in WBNP, that were radio collared and
relocated every two weeks. This data formed the basis for building a
movement model used to determine invasion probability.
The risk assessment
shows that the risk to the conventional livestock industry and
commercial captive bison herds is low while the risk to disease-free,
free-ranging bison is much higher.
Canadian
Food Inspection Agency
Risk
Assessment
Probability
of Infection
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Disease |
Wild Bison |
Commercial
Bison |
Commercial
Cattle |
Brucellosis
Monetary Consequences |
1 per 8 years
$668,750/ year
between outbreaks |
1 per 229 years
$28,384/ year
between outbreaks |
1 per 1276 years
$495/ year
between outbreaks |
| Tuberculosis
Monetary consequences |
1 per 6 years
$891,667/ year
between outbreaks |
1 per 173 years
$47,399/ year
between outbreaks |
1 per 1764 years
$472/ year
between outbreaks |
Disclaimer:
The above information was sourced from the Canadian Food Inspection Agency
report titled, Risk assessment on Bovine Brucellosis and Tuberculosis
in Wood Buffalo National Park and Area, January 1999.
The
following link will access the report entitled:
A Landscape Evaluation of Bison Movements and Distribution in
Northern Canada (Gates et al. 2001). One of the main objectives of this report was to provide results to APFRAN and the Canadian Food Inspection Agency
for refinement of
the 1999 disease risk assessment report.
This entire document can
be found at
here
(Large PDF = 18,000 KB)
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