Bactericidal activity of rifampin, isoniazid, moxifloxacin, and bedaquiline against 18b assessed by the Bactec MGIT through time to positivity (TTP). Data are shown as 2 log TTP mean with range (n = 2). Samples were taken at day 6 of the corresponding experiments. INH, isoniazid; RIF, rifampin; MXF, moxifloxacin; BDQ, bedaquiline; +, STR-exposed 18b; -, STR-starved 18b. Concentrations are indicated in μg/ml.