MPT64 antigen is not detected in NTM and Bacillus Calmette-Guerin strains with RD2 deletion; therefore, a positive MPT64 antigen test indicates the presence of Mtb.39 It is important to note that rapid antigen testing is part of TB culture laboratory workflow, and therefore does not have to be specifically ordered by clinicians. Here, PRPH2 is linked to tuberculosis.