The gamma interferon test will be used in parallel with the existing skin test, particularly to prevent disease becoming established in areas where there is little infection.

The gamma tests will be carried out in certain specific circumstances including on cattle which have given a negative skin test but which are in herds with new TB incidents in low-risk areas.

However, the test will also be available as a tool to help control disease in high-risk areas.

Source: fwi.co.uk