The ACTG is pleased to share the primary results of Study 31/A5349, which were presented at the 51st virtual Union World Conference on Lung Health on October 21st, 2020. This important study showed that the four-month regimen of rifapentine, isoniazid, pyrazinamide, and moxifloxacin (RPT-MOX) was non-inferior to the currently recommended six-month regimen of rifampicin, isoniazid, ethambutol, and pyrazinamide for the treatment of drug-susceptible pulmonary TB. RPT-MOX was also safe and well-tolerated by patients. A second four-month regimen of rifapentine, isoniazid, pyrazinamide, and ethambutol failed to meet the non-inferiority margin.