A Phase 2/3 interventional study of Rifabutin and Delamanid in Tuberculosis, Pulmonary and Tuberculosis Infection, sponsored by Centers for Disease Control and Prevention. Active, not recruiting at 8 sites in 6 countries. Open to participants aged 12 Years and older. Per ClinicalTrials.gov, last updated 2026-09-21.
Sponsored by Centers for Disease Control and Prevention · Phase 2/3, Interventional, and Treatment
The purpose of this study is to determine whether one or two 17-week regimens of tuberculosis treatment bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z)-- (BMZ) plus either Rifabutin (Rb) or Delamanid (D or DLM) are as effective as a standard six-month regimen for treatment of pulmonary tuberculosis (TB). All three regimens are administered daily, seven days each week.
The first 17-week regimen is 2 months of bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z), (BMZ) plus rifabutin (Rb) (BMZRB) followed by 2 months of bedaquiline (B or BDQ), moxifloxacin (M) and Rifabutin (Rb) (2 BMZRb/2 BMRb, Arm 1)
The Second 17-week regimen is 2 months of bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z), (BMZ) plus delamanid (D or DLM); (BMZD) followed by 2 months of bedaquiline (B or BDQ), moxifloxacin (M) and delamanid (D or DLM) (2 BMZD/2 BMD, Arm 2)
The standard 26-week treatment control regimen which is two months of isoniazid, rifampin, ethambutol, and pyrazinamide (2HRZE) followed by four months of isoniazid and rifampin (4HR); (2HRZE/4HR, Arm 3)
Target enrollment is 288 male and female participants (96/arm). participants. Participants will be followed until 78 weeks post-randomization, or until the last enrolled participant completes 52 weeks post-randomization, whichever comes first.
Phase 2C Clinical Trial of Novel, Short-course Regimens for the Treatment of Pulmonary Tuberculosis: CRUSH-TB (Combination Regimens for Shortening TB Treatment)
Hypotheses:
Phase: 3 Design: Open label, randomized clinical trial, initially in three treatment groups, with adaptive design allowing for introduction of novel regimens once they are clinically ready for testing Population: newly diagnosed with sputum smear positive or GeneXpert positive pulmonary tuberculosis, aged 12 years or older, with normal QTcF (QTc interval, Fridericia calculation) on screening ECG.
Number of Sites: 13 National and International sites, primarily sites of the Tuberculosis Trials Consortium Group. Study Duration: Duration per participant is approximately 78 weeks Description of Agent or Intervention: After written informed consent, participants will be randomized 1:1:1 to receive BMZRb, BMZD, or HRZE (Control treatment) as below
Arm 1(investigational regimen): 2 BMZRb/2 BMRb
Arm 2 (investigational regimen): 2 BMZD/2 BMD
Arm 3 (Control regimen): 2 RHZE/4 RH
Objectives
Primary Objectives:
Secondary Objectives:
Primary Endpoints:
1. Time to sputum culture negative in liquid media
Secondary Endpoints:
319 studies on the registry are indexed under Tuberculosis, Pulmonary; 71 are open to participants now.
This study's planned enrollment of 288 is above the median of 146 across 227 interventional studies indexed under Tuberculosis, Pulmonary.
Browse Tuberculosis, Pulmonary studies →Centers for Disease Control and Prevention is the lead sponsor of 275 studies on the registry; 2 are open to participants now.
Of its 11 completed or terminated interventional studies of FDA-regulated products, 8 (73%) have results posted.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
For participants with HIV:
Exclusion Criteria:
Laboratory parameters done at or within 14 days prior to screening:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
The number of CD4 cells, a type of white blood cell, in a given amount of blood. It is used to follow how well the immune system is doing in HIV.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
A 0–100 scale of how well someone can carry out everyday activities. 100 is no complaints and no signs of illness; 70 is able to look after yourself but not to work or keep up normal activity; 50 is needing considerable help and frequent medical care.
Studies often ask for 60 or 70 and above. Your doctor gives the score.
Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
A recording of the heart’s electrical activity, taken with stickers on the chest, arms and legs. It takes a few minutes and does not hurt.
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
CD4 count
The number of CD4 cells, a type of white blood cell, in a given amount of blood. It is used to follow how well the immune system is doing in HIV.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Karnofsky performance status (KPS)
A 0–100 scale of how well someone can carry out everyday activities. 100 is no complaints and no signs of illness; 70 is able to look after yourself but not to work or keep up normal activity; 50 is needing considerable help and frequent medical care.
Studies often ask for 60 or 70 and above. Your doctor gives the score.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Postmenopausal
Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECG (electrocardiogram)
A recording of the heart’s electrical activity, taken with stickers on the chest, arms and legs. It takes a few minutes and does not hurt.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
QT and QTc
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ALT and AST (liver enzymes)
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ULN (upper limit of normal)
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Bilirubin
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Platelets
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Absolute neutrophil count (ANC)
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Eight weeks of daily treatment with bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z), plus rifabutin (Rb), followed by nine weeks of daily treatment with bedaquiline (B or BDQ), moxifloxacin (M) and Rifabutin (Rb) All drugs are administered orally, seven days/week, directly observed by a health care worker at least five of the seven days each week. Pyridoxine (vitamin B6), 25 or 50 mg, is administered once daily. Study drug doses: Bedaquiline (B): 200 mg once daily x 56 days, then 100 mg daily; Moxifloxacin (M): 400 mg once daily; Pyrazinamide (Z) 1500 mg (weight \<75kg) or 2000mg(\> 75kg) once daily x 56 days; Rifabutin (Rb): 300 mg once daily
Drug: Rifabutin · Drug: Bedaquiline · Drug: Moxifloxacin · Drug: Pyrazinamide
Eight weeks of daily treatment with bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z), plus delamanid (D or DLM) followed by nine weeks of daily treatment with bedaquiline (B or BDQ), moxifloxacin (M) and delamanid (D or DLM) All drugs are administered orally, seven days/week, directly observed by a health care worker at least five of the seven days each week. Pyridoxine (vitamin B6), 25 or 50 mg, is administered once daily. Study drug doses: Bedaquiline (B): 200 mg once daily x 56 days, then 100 mg daily; Moxifloxacin (M): 400 mg once daily; Pyrazinamide (Z) 1500 mg (weight \<75kg) or 2000mg(\> 75kg) once daily x 56 days; Delamanid (D):300 mg once daily
Drug: Delamanid · Drug: Bedaquiline · Drug: Moxifloxacin · Drug: Pyrazinamide
Eight weeks of daily treatment with rifampin, isoniazid, pyrazinamide, and ethambutol, followed by eighteen weeks of daily treatment with rifampin and isoniazid All drugs are administered orally, seven days/week, directly observed by a health care worker at least five of the seven days each week. Pyridoxine (vitamin B6), 25 or 50 mg, is administered once daily study drug doses: Rifampin (R), 600 mg daily; Isoniazid (H), 300 mg daily; Pyrazinamide (Z) 1500 mg (weight \<75kg) or 2000mg(\> 75kg) once daily ; Ethambutol, 15 mg/kg once daily rounded up to nearest 400 mg dose
Drug: Pyrazinamide · Drug: Isoniazid · Drug: Rifampin · Drug: Ethambutol
Rifabutin (Rb) is added to the bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z), (BMZ) regimen for first 8 weeks and continued for next 9 weeks with bedaquiline (B or BDQ) and moxifloxacin (M)
Also known as: Rb-RBT
Delamanid (D or DLM) is added to the bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z), (BMZ) regimen for first 8 weeks and continued for next 9 weeks with bedaquiline (B or BDQ) and moxifloxacin (M)
Also known as: Deltyba
Bedaquiline is part of interventional arms with bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z)-- (BMZ).
Also known as: Sirturo
Moxifloxacin is part of interventional arms with bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z)-- (BMZ).
Also known as: M
Pyrazinamide is part of interventional arms with bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z)-- (BMZ). Pyrazinamide is part of control regimen (HRZE).
Also known as: Z-PZA
Isoniazid is part of control regimen (HRZE).
Also known as: H-INH
Rifampin is part of control regimen (HRZE).
Also known as: R
Ethambutol is part of control regimen (HRZE).
Also known as: E
Time to sputum culture negative in liquid media after study treatment among participants in Experimental Regimens (2 BZMRb/ 2 BMRb, Arm 1) and (2 BMZD/ 2 BMD, Arm 2) compared to Control (2HRZE/4HR, Arm 3) in modified intention-to-treat group (ITT)
The purpose of this study is to determine whether one or two 17-week regimens of tuberculosis treatment bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z)-- (BMZ) plus either Rifabutin (Rb) or Delamanid (D or DLM) are as effective as a standard six-month regimen for treatment of pulmonary tuberculosis (TB). All three regimens are administered daily, seven days each week. The time to culture negative will be defined as the time from randomization to the date of the first of at least two consecutive negative sputum cultures, collected on different study visits, irrespective of any subsequent positive cultures that may occur. Modified intention-to-treat group includes all participants in the ITT population (all enrolled participants who receive a treatment assignment) except late exclusions
Time frame: 17 weeks
The proportion of participants with a grade 3 or higher adverse event in Experimental Regimens (2 BZMRb/2 BMRb, Arm 1) and (2 BMZD/2 BMD, Arm 2) compared to Control Regimen (2HRZE/4HR, Arm 3) in the modified intention-to-treat group
To evaluate the safety of one or two 17-week regimens of tuberculosis treatment bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z)-- (BMZ) plus either Rifabutin (Rb) or Delamanid (D or DLM) are as effective as a standard six-month regimen for treatment of pulmonary tuberculosis (TB). All three regimens are administered daily, seven days each week. Safety Analysis includes all participants in the ITT population that receive at least one dose of study medication
Time frame: up to 78 weeks
The proportion of participants experiencing lack of sustained cure in each experimental regimens (2BZMRb/2BMRb, Arm 1) and (2BMZD/2BMD, Arm 2) compared to Control Regimen (2HRZE/4HR, Arm 3)
Sustained Culture Negativity is achieved when a participant's last two culture results collected on different study visits are negative (without an intervening positive result), the last of which is collected no earlier than 48 weeks after randomization (allowing for a 4 week window prior to the 52 week timepoint
Time frame: up to 52 weeks
The proportion of participants experiencing lack of sustained cure in each experimental regimens (2BZMRb/2BMRb, Arm 1) and (2BMZD/2BMD, Arm 2) compared to Control Regimen (2HRZE/4HR, Arm 3)
Sustained Culture Negativity is achieved when a participant's last two culture results regimens (2BZMRb/2BMRb, Arm 1) and (2BMZD/2BMD, Arm 2) compared to Control Regimen (2HRZE/4HR, Arm 3)collected on different study visits are negative (without an intervening positive result), the last of which is collected no earlier than 48 weeks after randomization (allowing for a 4 week window prior to the 52 week timepoint
Time frame: up to 78 weeks
Time to sputum culture negative in solid media after study treatment assignment among participants in Experimental Regimens (2BZMRb/2BMRb, Arm 1) and (2BMZD/2BMD, Arm 2) compared to Control Regimen (2HRZE/4HR, Arm 3) in modified intention-to-treat group
The purpose of this study is to determine whether one or two 17-week regimens of tuberculosis treatment bedaquiline (B or BDQ), moxifloxacin (M), pyrazinamide (Z)-- (BMZ) plus either Rifabutin (Rb) or Delamanid (D or DLM) are as effective as a standard six-month regimen for treatment of pulmonary tuberculosis (TB). All three regimens are administered daily, seven days each week. The time to culture negative will be defined as the time from randomization to the date of the first of at least two consecutive negative sputum cultures, collected on different study visits, irrespective of any subsequent positive cultures that may occur. Modified intention-to-treat group includes all participants in the ITT population (all enrolled participants who receive a treatment assignment) except late exclusions
Time frame: up to 78 weeks
Proportion of participants with sputum culture negative by 8 weeks and by 12 weeks (solid and liquid media) in all 3 regimens
The time to culture negative will be defined as the time from randomization to the date of the first of at least two consecutive negative sputum cultures, collected on different study visits, irrespective of any subsequent positive cultures that may occur
Time frame: 8 weeks and 12 weeks
All-cause study drug discontinuation among participants in experimental regimens compared to control regimen
Any discontinuation in study treatment by the participant
Time frame: up to 26 weeks
The rate of change in time to sputum culture positivity (TTP) through 17 weeks in the Mycobacterial Growth Indicator Tube (Bactec MGIT960) among participants in all three regimens
rate of change in time to sputum culture positivity (TTP) through 17 weeks in the Mycobacterial Growth Indicator Tube (Bactec MGIT960) will be measured and compared
Time frame: 17 weeks
Clearance of bedaquiline
Population PK parameter, Clearance of bedaquiline with or without rifabutin co-administration, will be measured for each experimental arm
Time frame: 17 weeks
Volume of Distribution of bedaquiline
Population PK parameter, Volume of Distribution of bedaquiline with or without rifabutin co-administration, will be measured for each experimental arm
Time frame: 17 weeks
Rate of absorption of bedaquiline
Population PK parameter: rate of absorption of bedaquiline with or without rifabutin co-administration, will be measured for each experimental arm
Time frame: 17 weeks
Plan to share: Yes — Data being collected in CDISC format
Supporting information: Study protocol, Informed consent form
Time frame: After the study completion and during results submission
Access criteria: Upon request
This study is active, not recruiting, as verified in Sep 2026. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Studies of the drugs tested here: Rifabutin · OPC-67683 · Bedaquiline · Moxifloxacin
Centers for Disease Control and Prevention →