TB Host Directed Therapy

Inclusion Criteria: 1. Willing and able to provide signed written consent or witnessed oral consent in the case of illiteracy, prior to undertaking any trial-related procedures. 2. Aged 18 to 65 years, male, or if female, either not of reproductive potential (post-menopause, or status-post surgical sterilization) or with an intrauterine contraceptive device in place. 3. Body weight (in light clothing without shoes) between 40 and 90 kg. 4. First episode of pulmonary tuberculosis diagnosed by positive sputum AFB smear with subsequent culture confirmation OR positive Xpert TB/RIF with Ct \<20 \[4\]. 5. RIF susceptibility diagnosed by Xpert TB/RIF OR Hain test 6. Chest radiograph meeting criteria for moderate or far advanced pulmonary tuberculosis \[5\] 7. HIV-1 seronegative 8. HBsAg negative Exclusion Criteria: 1. Any condition for which participation in the trial, as judged by the investigator, could compromise the well-being of the subject or prevent, limit or confound protocol specified assessments 2. Current or imminent treatment for malaria. 3. Is critically ill, and in the judgment of the investigator has a diagnosis likely to result in death during the trial or the follow-up period. 4. TB meningitis or other forms of severe tuberculosis with high risk of a poor outcome as judged by the investigator. 5. History of allergy or hypersensitivity to any of the trial therapies or related substances, including known allergy or suspected hypersensitivity to rifampin or rifabutin. 6. Having participated in other clinical trials with investigational agents within 8 weeks prior to trial start or currently enrolled in an investigational trial. 7. Subjects with any of the following at screening: 1. Cardiac arrhythmia requiring medication; 2. Prolongation of QT/QTc interval with QTcF (Fridericia correction) \>450 ms; 3. History of additional risk factors for Torsade de Pointes, (e.g., heart failure, hypokalemia, family history of Long QT Syndrome); 4. Any clinically significant ECG abnormality, in the opinion of the investigator. 5. Patients requiring concomitant medications that prolong the QT inter-val. 8. Random blood glucose \>140 mg/dL, or history of unstable Diabetes Mellitus which required hospitalization for hyper- or hypoglycaemia within the past year prior to start of screening. 9. Use of systemic corticosteroids within the past 28 days. 10. Subjects with any of the following abnormal laboratory values: 1. creatinine \>2 mg/dL 2. haemoglobin \<8 g/dL 3. platelets \<100x109 cells/L 4. serum potassium \<3.5 5. aspartate aminotransferase (AST) ≥2.0 x ULN 6. alkaline phosphatase (AP) \>5.0 x ULN 7. total bilirubin \>1.5 mg/dL