The Canadian Food Inspection Agency has placed 26 000 cattle under quarantine in Alberta and Saskatchewan after cases of bovine TB have been found since late September. At least 10 000 of these cattle will have to to be destroyed, because they may have had a point of contact with the 6 known cases.

The origin of the outbreak is a mystery, as it is not related to indigenous strains of bovine TB found in Canada among wildlife. The closest related strain found so far is a strain that was detected in Mexico in the 1990's. Canada’s cattle herd has been considered bovine TB free since the 1920's.

CBC article