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Bovine tuberculosis (bTB) is a bacterial disease associated with infections of Mycobacterium bovis (M. bovis), a species in the M. tuberculosis complex. The disease mostly affects cattle but can become established in other species. In some countries, specific wildlife species can maintain infections and pose risk of re-infecting cattle.
This is a federally reportable disease and all cases must be reported to the CFIA. Bovine TB is also a provincially notifiable animal disease. See below for How to report suspected or confirmed cases.
In countries with eradication programs such as Canada, advanced bTB is rare. Most cases are detected at an early stage when infection typically consists of few or small lesions in the lungs or lymph nodes associated with the respiratory system.
In Canada, few bTB infections progress to the point of presenting clinical signs. But when progressive disease does occur, the general signs are:
- loss of appetite
- fluctuating fever
When the lungs are extensively diseased, there can be an intermittent, hacking cough.
For more information on the disease, see Bovine tuberculosis fact sheet (CFIA).
How to report
If you suspect bovine tuberculosis in your herd, call your veterinarian within 24 hours.
Bovine tuberculosis is a provincially notifiable disease under Alberta's Animal Health Act and must be monitored. It is also a reportable disease under the federal Health of Animals Act and all cases must be reported to the Canadian Food Inspection Agency.
All suspected or confirmed cases must be reported to the Office of the Chief Provincial Veterinarian (OCPV) within 24 hours:
Hours: 8:15 am to 4:30 pm (open Monday to Friday, closed statutory holidays)
Risk to humans
Bovine tuberculosis is a zoonotic disease (transmitted between animals and humans). It does not pose a threat to public health due in part to the extremely low prevalence of the disease in Canada.
Although human cases of bTB are rare, humans may be at greater risk of acquiring the bacteria as a result of:
- extended close contact with an animal with active respiratory TB
- consuming unpasteurized milk or milk products from an infected cow
For more information on the risk of human exposure, see Bovine tuberculosis fact sheet (CFIA).
2016 bTB Investigation
In fall 2016, M. bovis was detected in a beef cow from southeastern Alberta. CFIA initiated an immediate livestock investigation. Information about the investigation is available on the CFIA website: Bovine tuberculosis investigation in Western Canada.
Resources – bTB in wildlife
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