In the study by Bertrand et al., efavirenz clearance decreased by 24% after completion of anti-TB co-treatment among rapid acetylator subjects with the CYP2B6*1/*1 genotype, but increased by 11.6%, 33% and 19% among slow acetylators with CYP2B6*1/*1, *1/*6 and *6/*6 genotype, respectively. Here, CYP2B6 is linked to tuberculosis.