We randomly assigned patients with newly diagnosed , smear-positive , drug-sensitive tuberculosis to one of three regimens : a control regimen that included 2 months of ethambutol , isoniazid , rifampicin , and pyrazinamide administered daily followed by 4 months of daily isoniazid and rifampicin ; a 4-month regimen in which the isoniazid in the control regimen was replaced by moxifloxacin administered daily for 2 months followed by moxifloxacin and 900 mg of rifapentine administered twice weekly for 2 months ; or a 6-month regimen in which isoniazid was replaced by daily moxifloxacin for 2 months followed by one weekly dose of both moxifloxacin and 1200 mg of rifapentine for 4 months .