ESAT‐6 (Rv3875), Rv3872, CFP‐10 (Rv3874) and Rv3879 in RD1 (Dillon et al., 2000; Mukherjee et al., 2007; Liu et al., 2016), Rv1980c in RD2 (Zhu et al., 2012), Rv0222 in RD4 (Rosenkrands et al., 2008), Rv0310c in RD8, Rv1255c in RD10 (Luo et al., 2017), Rv3425 in RD11 (Zhang et al., 2007), and Rv2645 in RD13 (Luo et al., 2015) have shown potential as TB diagnostic antigens. The gene discussed is PRPH2; the disease is tuberculosis.