IFNG and infection: The IFN‐γ test is used in addition to the SICCT test when specific criteria are met and can be particularly useful in detecting bTB‐positive animals that have become desensitised to the SICCT test as a result of repeated testing (Coad et al., 2010), those co‐infected with other Mycobacterium spp., and animals in early stages of infection (de la Rua‐Domenech et al., 2006).