CXCR5 and tuberculosis: We did a best subsets discriminant analysis, revealing that a combination of five genes gave a better discriminatory power: the combination of Bcl2, BLR1, MARCO, FcγR1A and IL4δ2 detected 95.65% (determined using leave-one-out cross validation) of household contacts and 91.66% of TB cases were correctly classified (Table 2).