A single case of bovine tuberculosis has led to about 30 ranches in southern Alberta being placed under quarantine.
The case was reported in September in an Alberta cow that was slaughtered in the United States.
The Canadian Food Inspection Agency says its veterinarians and inspectors are making contact with cattle producers in five agricultural zones and are working with provincial authorities to investigate the report.
Canada is considered to be officially free of Bovine TB although isolated cases may occur.
The disease generally does not pose a threat to public health.