Description of infographic - Trace-in Herd Tuberculosis Testing Process
All herds that provided animals to the index herd are subject to testing.
All animals in the trace-in herd must be quarantined.
An inspector performs diagnostic screening tests.
Tuberculin is injected into the animal's skin
A blood sample is drawn.
After 72 hours, the cattle must be re-assembled in order to read the skin test. If the skin test is negative no further testing is required. A supplemental test (usually a blood test) is done on any reactors.
If the second test is positive, the test positive animals will be humanely slaughtered and tissue samples will be collected for confirmatory testing.
Any lesions found with suspicious bacteria are tested for bovine TB DNA.
Samples are cultured for about 12 weeks in a CFIA laboratory. Any bacterial growth is tested for bovine TB DNA.
If tissue samples from any adult cattle test positive the entire herd will be humanely depopulated. A new investigation is done to determine potential spread to other animals and herds.
If all the adult cattle test negative, the herd can be released from quarantine.Footnote 1.
A new investigation is done to determine potential spread to cows in other herds
Total testing time: 14 weeks