Leprosy Skin Test Antigens Trial

Study Overview
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Brief Summary
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The purpose of this study is to see how healthy people and leprosy patients react to 2 new skin tests for detecting leprosy. The study will evaluate the new skin tests that may aid in measuring the number of people exposed to leprosy and enable its diagnosis and treatment at an earlier stage. Participant's ages 18-60 living in Kathmandu, Nepal will be enrolled. Stages A and B of the study will use the skin test in healthy volunteers. Stage C will use the skin test in high risk volunteers (including individuals with leprosy), healthy individuals in contact with leprosy patients and individuals with tuberculosis (TB, lung disease). Study procedures will include injections, physical exam, and blood testing. Injection sites will be checked several times during the participant's study involvement (5 hours of time spread over approximately 1 month). Volunteers screened for the study, which have leprosy or tuberculosis will be treated or referred for treatment.

Detailed Description
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This double-blind Phase II clinical trial will be conducted in 3 stages to evaluate 2 new leprosy skin test antigens, Mycobacterium (M.) leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) and M. leprae Cell Wall Antigen (MLCwA), as diagnostic-epidemiological tools designed to measure incidence of leprosy infection in Kathmandu, Nepal, a leprosy endemic area. Stage A will provide an initial indication of safety of the 2 new test antigens in 10 healthy members of the leprosy endemic population (5 subjects per antigen at 2 dosages each). Stage B will expand this analysis by an additional 90 healthy subjects (45 subjects per antigen). If any subjects in Stage A or B show ulcerations at the 1.0 mcg dose of MLSA-LAM or MLCwA test sites, then only the 0.1 mcg dose will be used for Stage C. The final stage, Stage C, is divided into 2 parts. The first part, Stage C-1, will assess safety of both antigens at the high dose (1.0 mcg) in populations at a higher risk of developing ulcerations at skin test sites. Eighty subjects will be recruited: 20 household contacts of Borderline Lepromatous Leprosy (BL) / Lepromatous Leprosy (LL) leprosy patients, 20 BL/LL leprosy patients, 20 Borderline Tuberculoid Leprosy (BT) / Tuberculoid Leprosy (TT) patients and 20 tuberculosis (TB) patients. The second part, Stage C-1b, is a continuation of Stage C-1 with the same number of subjects recruited from the same groups to assess the reactivity of both antigens at the low dose (0.1 mcg). This study will define a positive skin test reaction for MLSA-LAM and MLCwA, and this definition will be used in estimating sensitivity and specificity for each skin test antigen and dosage. It is expected that the BT/TT leprosy patients and healthy contacts of leprosy patients will have larger indurations at both M. leprae-derived antigen sites and a variable reaction at the tuberculin/Purified Protein Derivative (PPD) site. The non-contacts, BL/LL leprosy patients, and TB patients will have smaller indurations at all leprosy skin test sites and a variable reaction at the tuberculin/PPD site. Finally, the TB patients will react with a large induration at the tuberculin/PPD site. Primary study objectives are to evaluate safety of these 2 new leprosy skin test antigens and to estimate specificity and sensitivity of these skin test antigens in detecting M. leprae infection by: selecting a dosage of the MLSA-LAM and MLCwA antigens that causes minimal induration in healthy non-exposed subjects; selecting a size of induration that will serve as a definition of a positive skin test reaction for MLSA-LAM and MLCwA in leprosy patients; and comparing proportion of positive skin test reactors in healthy subjects to proportion in BT/TT and BL/LL leprosy patients, contacts of leprosy patients, and TB patients. Secondary study objectives are to compare mean size of induration in response to each test antigen in healthy subjects versus BT/TT and BL/LL leprosy patients, contacts of leprosy patients, and TB patients as a measure of specificity and sensitivity; to compare the specificity and sensitivity of the 2 new antigens with tuberculin/PPD in patients with clinical leprosy, contacts of leprosy patients, and healthy unexposed subjects (non-patient contacts); to quantify release of IFN-gamma from lymphocytes in whole blood from leprosy patients, leprosy patient contacts, TB patients, and healthy nonexposed subjects, following in vitro stimulation with leprosy skin test antigens and PPD, using the QuantiFERON-CMI (Cellestis Limited, Valentia California) kit. Results will be compared to the magnitude of the skin test response; and to determine if antibodies against a M. leprae specific anti

Official Title
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Two New Leprosy Skin Test Antigens: MLSA-LAM and MLCwA Phase II Study in a Leprosy-Endemic Region

Conditions
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Leprosy

Intervention / Treatment
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* Biological: Tuberculin, Purified Protein Derivative
* Other: MLSA-LAM
* Other: MLCwA
* Biological: Tuberculin, Purified Protein Derivative
* Other: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All Subjects Between the ages of 18 and 60 years old Male or female; not less than 30 percent for one gender Agree to participate in the study after verbal explanation by the physician and nurses, as indicated by signing an informed consent form Weight greater than 30 Kg (female) and 38 Kg (male) Available for skin test readings Nepali residents, including expatriates from India Healthy, Non-Contacts Healthy (determined by history and physical examination) No household or working contact with tuberculosis or leprosy patients Contacts of Leprosy Patients Healthy (determined by history and physical examination) Household contact of a person with leprosy for at least 6 months duration, and within 6 months of this study, or a person professionally exposed to leprosy for at least 5 years duration, and within 6 months of this study Persons with Leprosy Having one or more of the following symptoms: Hypopigmented or erythematous skin lesion(s) with definite loss of sensation Damage to the peripheral nerves as demonstrated by palpable thickening with or without impairment of sensation and/or weakness of the muscles of hands, feet or face Presence of acid-fast bacilli in slit skin smears Histological changes diagnostic of leprosy in skin biopsy Receiving standard multi drug treatment for leprosy or completed treatment for leprosy no more than 4 years prior to study enrollment Persons with Tuberculosis Having active tuberculosis as defined by one of the following: Extra-pulmonary tuberculosis if confirmed by culture Pulmonary tuberculosis, defined as: Having a history of a productive cough of more than 3 weeks duration that may be accompanied by night sweats, loss of appetite, haemoptysis, weight loss, chest pain, or shortness of breath, and Having one or more of the following diagnostic criteria: Sputum smear-positive, defined as one or more of the following: at least 2 of 3 successive sputum samples positive for acid-fast bacilli by microscopy; or at least one sputum specimen positive and x-ray abnormalities consistent with pulmonary tuberculosis; or at least one positive sputum specimen that is culture positive for Mycobacterium tuberculosis Sputum smear-negative, defined as three sputum specimens negative for acid-fast bacilli but with x-ray evidence consistent with pulmonary tuberculosis and that does not clear with non-tuberculosis antibiotics; or three sputum samples negative for acid-fast bacilli by microscopy but culture positive for Mycobacterium tuberculosis Completed the intensive phase of chemotherapy for tuberculosis, but still undergoing the continuation phase of therapy Exclusion Criteria: All subjects Pregnant (as determined by a urine pregnancy test performed on females of child-bearing age on Day 0, prior to admission into the study) or lactating females Currently on oral corticosteroid or other immunosuppressive treatment Cancer, diabetes, or other chronic illness Extra-pulmonary tuberculosis not confirmed by culture Known hypersensitivities or allergies Expatriates other than those from India Participation in an earlier stage of this study Concurrent participation in another clinical trial Healthy, Non-Contacts History of treated tuberculosis or leprosy Clinical signs of leprosy or tuberculosis Known contact with persons with leprosy or tuberculosis Healthy Contacts of Leprosy Patients History of treated tuberculosis or leprosy Clinical signs of leprosy or tuberculosis Persons with Leprosy Leprosy patients in reversal reaction or erythema nodosum leprosum (ENL) reaction or those being treated with corticosteroids or thalidomide for these conditions History of treated tuberculosis Clinical signs of tuberculosis Completed full course of standard multidrug treatment (MDT) for leprosy more than 4 years prior to study enrollment Persons with Tuberculosis History of treated leprosy Clinical signs of leprosy Completed full course of standard tuberculosis treatment Known contact with leprosy patients

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: A1-Ramping (MLSA-LAM)<br>5 subjects to receive: 1.0 mcg of MLSA-LAM, 0.1 mcg of MLSA-LAM, 5 TU Purified Protein Derivative/Tubersol®, saline (NaCl). | Other: MLSA-LAM<br>* Mycobacterium leprae soluble antigen with minimal amounts of immunosuppressive lipoglycans; dosages 0.1 and 1.0 micrograms; administered in sterile diluent 0.9% saline (NaCl).<br>Biological: Tuberculin, Purified Protein Derivative<br>* Licensed TB reagent, 100 microliters, 5 TU dose.<br>Other: Placebo<br>* Saline (NaCl) serves as a diluent control in Stage A and B only.<br>|
| Experimental: C1-Target Population<br>80 subjects to receive: 1.0 mcg of MLSA-LAM, 1.0 mcg of MLCwA and 2TU Purified Protein Derivative/RT-23. | Biological: Tuberculin, Purified Protein Derivative<br>* A tuberculin skin test used to diagnose latent tuberculosis (TB) infection. 2 TU dose<br>Other: MLSA-LAM<br>* Mycobacterium leprae soluble antigen with minimal amounts of immunosuppressive lipoglycans; dosages 0.1 and 1.0 micrograms; administered in sterile diluent 0.9% saline (NaCl).<br>Other: MLCwA<br>* Cell wall-associated proteins of Mycobacterium leprae; dosages 0.1 and 1.0 micrograms; administered in sterile diluent 0.9% saline (NaCl).<br>|
| Experimental: C-1b-Target Population (Low Dose)<br>80 subjects to receive: 0.1 mcg MLSA-LAM, 0.1 mcg MLCwA, 2 TU Purified Protein Derivative/RT-23. | Biological: Tuberculin, Purified Protein Derivative<br>* A tuberculin skin test used to diagnose latent tuberculosis (TB) infection. 2 TU dose<br>Other: MLSA-LAM<br>* Mycobacterium leprae soluble antigen with minimal amounts of immunosuppressive lipoglycans; dosages 0.1 and 1.0 micrograms; administered in sterile diluent 0.9% saline (NaCl).<br>Other: MLCwA<br>* Cell wall-associated proteins of Mycobacterium leprae; dosages 0.1 and 1.0 micrograms; administered in sterile diluent 0.9% saline (NaCl).<br>|
| Experimental: B2-Full-Scale (MLCwA)<br>45 subjects to receive: 1.0 mcg of MLCwA, 0.1 mcg of MLCwA, 5 TU Purified Protein Derivative/Tubersol®, saline (NaCl). | Other: MLCwA<br>* Cell wall-associated proteins of Mycobacterium leprae; dosages 0.1 and 1.0 micrograms; administered in sterile diluent 0.9% saline (NaCl).<br>Biological: Tuberculin, Purified Protein Derivative<br>* Licensed TB reagent, 100 microliters, 5 TU dose.<br>Other: Placebo<br>* Saline (NaCl) serves as a diluent control in Stage A and B only.<br>|
| Experimental: B1-Full-Scale (MLSA-LAM)<br>45 subjects to receive: 1.0 mcg of MLSA-LAM, 0.1 mcg of MLSA-LAM, 5 TU Purified Protein Derivative/Tubersol®, saline (NaCl). | Other: MLSA-LAM<br>* Mycobacterium leprae soluble antigen with minimal amounts of immunosuppressive lipoglycans; dosages 0.1 and 1.0 micrograms; administered in sterile diluent 0.9% saline (NaCl).<br>Biological: Tuberculin, Purified Protein Derivative<br>* Licensed TB reagent, 100 microliters, 5 TU dose.<br>Other: Placebo<br>* Saline (NaCl) serves as a diluent control in Stage A and B only.<br>|
| Experimental: A2-Ramping (MLCwA)<br>5 subjects to receive: 1.0 mcg of MLCwA, 0.1 mcg of MLCwA, 5 TU Purified Protein Derivative/Tubersol®, saline (NaCl). | Other: MLCwA<br>* Cell wall-associated proteins of Mycobacterium leprae; dosages 0.1 and 1.0 micrograms; administered in sterile diluent 0.9% saline (NaCl).<br>Biological: Tuberculin, Purified Protein Derivative<br>* Licensed TB reagent, 100 microliters, 5 TU dose.<br>Other: Placebo<br>* Saline (NaCl) serves as a diluent control in Stage A and B only.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of Participants With Reactions to the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 0.1 Microgram | Participants returned to the clinic at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups), for reader measurements of erythema and induration and assessment of other adverse events of pain/tenderness, bleeding, urticaria, infection, or blistering/ulcerating. Participants are counted if they had any measurable erythema or induration, or reported any of the other listed adverse events. Reactions were reported as present or absent, and were not graded for severity. | Up to 28 Days | 
| Number of Participants With the Reaction of Itching to the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 0.1 Microgram | Itching was assessed for participants in Groups B and C only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. Itching was reported as present or absent, and not graded for severity. | Up to 28 Days | 
| Number of Participants With Reactions to the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 1.0 Microgram | Participants returned to the clinic at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups), for reader measurements of erythema and induration and assessment of other adverse events of pain/tenderness, bleeding, urticaria, infection, or blistering/ulcerating. Participants are counted if they had any measurable eythema or induration, or reported any of the other listed adverse events. Reactions were reported as present or absent, and were not graded for severity. | Up to 28 Days | 
| Number of Participants With the Reaction of Itching to the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 1.0 Microgram | Itching was assessed for participants in Groups B and C only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. Itching was reported as present or absent, and not graded for severity. | Up to 28 Days | 
| Number of Participants With Reactions to the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 0.1 Microgram | Participants returned to the clinic at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups), for reader measurements of erythema and induration and assessment of other adverse events of pain/tenderness, bleeding, urticaria, infection, or blistering/ulcerating. Participants are counted if they had any measurable eythema or induration, or reported any of the other listed adverse events. Reactions were reported as present or absent, and were not graded for severity. | Up to 28 Days | 
| Number of Participants With Reaction of Itching to the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 0.1 Microgram | Itching was assessed for participants in Groups B and C only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. Itching was reported as present or absent, and not graded for severity. | Up to 28 Days | 
| Number of Participants With Reactions to the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 1.0 Microgram | Participants returned to the clinic at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups), for reader measurements of erythema and induration and assessment of other adverse events of pain/tenderness, bleeding, urticaria, infection, or blistering/ulcerating. Participants are counted if they had any measurable eythema or induration, or reported any of the other listed adverse events. Reactions were reported as present or absent, and were not graded for severity. | Up to 28 Days | 
| Number of Participants With the Reaction of Itching to the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 1.0 Microgram | Itching was assessed for participants in Groups B and C only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. Itching was reported as present or absent, and not graded for severity. | Up to 28 Days | 
| Number of Participants With Reactions to the Antigen Purified Protein Derivative (PPD) | Participants returned to the clinic at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups), for reader measurements of erythema and induration and assessment of other adverse events of pain/tenderness, bleeding, urticaria, infection, or blistering/ulcerating. Participants are counted if they had any measurable eythema or induration, or reported any of the other listed adverse events. Reactions were reported as present or absent, and were not graded for severity. | Up to 28 Days | 
| Number of Participants With the Reaction of Itching to the Antigen Purified Protein Derivative (PPD) | Itching was assessed for participants in Groups B and C only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. Itching was reported as present or absent, and not graded for severity. | Up to 28 Days | 
| Mean Diameter of Erythema at Site of Injection With the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 0.1 Micrograms | If erythema was present, it was measured in millimeters for participants in Groups C1 and C1b only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. | Day 3 | 
| Mean Diameter of Erythema at Site of Injection With the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 0.1 Micrograms | If erythema was present, it was measured in millimeters for participants in Groups C1 and C1b only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. | Day 7 | 
| Mean Diameter of Erythema at Site of Injection With the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 1.0 Micrograms | If erythema was present, it was measured in millimeters for participants in Groups C1 and C1b only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. | Day 3 | 
| Mean Diameter of Erythema at Site of Injection With the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 1.0 Micrograms | If erythema was present, it was measured in millimeters for participants in Groups C1 and C1b only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. | Day 7 | 
| Mean Diameter of Erythema at Site of Injection With the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 0.1 Micrograms | If erythema was present, it was measured in millimeters for participants in Groups C1 and C1b only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. | Day 3 | 
| Mean Diameter of Erythema at Site of Injection With the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 0.1 Micrograms | If erythema was present, it was measured in millimeters for participants in Groups C1 and C1b only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. | Day 7 | 
| Mean Diameter of Erythema at Site of Injection With the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 1.0 Micrograms | If erythema was present, it was measured in millimeters for participants in Groups C1 and C1b only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. | Day 3 | 
| Mean Diameter of Erythema at Site of Injection With the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 1.0 Micrograms | If erythema was present, it was measured in millimeters for participants in Groups C1 and C1b only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. | Day 7 | 
| Mean Diameter of Erythema at Site of Injection With the Antigen Purified Protein Derivative (PPD) | If erythema was present, it was measured in millimeters for participants in Groups C1 and C1b only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. | Day 3 | 
| Mean Diameter of Erythema at Site of Injection With the Antigen Purified Protein Derivative (PPD) | If erythema was present, it was measured in millimeters for participants in Groups C1 and C1b only, who returned to the clinic at Days 3 and 7, and at Day 28 if reactions were still present. | Day 7 | 
| Mean Diameter of Induration at Site of Injection With the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 0.1 Micrograms | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 3 | 
| Mean Diameter of Induration at Site of Injection With the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 0.1 Micrograms | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 7 | 
| Mean Diameter of Induration at Site of Injection With the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 1.0 Micrograms | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 2 | 
| Mean Diameter of Induration at Site of Injection With the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 1.0 Micrograms | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 3 | 
| Mean Diameter of Induration at Site of Injection With the Antigen Mycobacterium (M.) Leprae Soluble Antigen (MLSA)-Lipoarabinomannan (LAM) at Doses of 1.0 Micrograms | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 7 | 
| Mean Diameter of Induration at Site of Injection With the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 0.1 Micrograms | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 3 | 
| Mean Diameter of Induration at Site of Injection With the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 0.1 Micrograms | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 7 | 
| Mean Diameter of Induration at Site of Injection With the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 1.0 Micrograms | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 2 | 
| Mean Diameter of Induration at Site of Injection With the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 1.0 Micrograms | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 3 | 
| Mean Diameter of Induration at Site of Injection With the Antigen M. Leprae Cell Wall Antigen (MLCwA) at Doses of 1.0 Micrograms | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 7 | 
| Mean Diameter of Induration at Site of Injection With the Antigen Purified Protein Derivative (PPD) | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 2 | 
| Mean Diameter of Induration at Site of Injection With the Antigen Purified Protein Derivative (PPD) | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 3 | 
| Mean Diameter of Induration at Site of Injection With the Antigen Purified Protein Derivative (PPD) | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 7 | 
| Mean Diameter of Induration at Site of Injection With the Antigen Purified Protein Derivative (PPD) | If induration was present, it was measured in millimeters at Days 2 (Group A), 3 (all groups) and 7 (Groups B and C), and at Day 28 if reactions were still present (all groups). | Day 28 | 
| Number of Participants With QuantiFERON Responses Based on the Presence or Absence of Induration at the Injection Site for the Antigen MLSA-LAM at Doses of 0.1 Microgram. | Blood collection for the QuantiFERON assessment was at Day 0 prior to antigen administration. Participants are considered to have a positive QuantiFERON response if the result was greater than 0. The categories present the number of participants who are positive or negative by QuantiFERON based on whether or not induration was assessed as present at any of the follow up visit assessments. A fifth category is listed to report the number of participants who were missing either a QuantiFERON result or induration assessment. The categories are mutually exclusive. | Day 0 for QuantiFERON; Days 3, 7, and 28 for induration | 
| Number of Participants With QuantiFERON Responses Based on the Presence or Absence of Induration at the Injection Site for the Antigen MLSA-LAM at Doses of 1.0 Microgram. | Blood collection for the QuantiFERON assessment was at Day 0 prior to antigen administration. Participants are considered to have a positive QuantiFERON response if the result was greater than 0. The categories present the number of participants who are positive or negative by QuantiFERON based on whether or not induration was assessed as present at any of the follow up visit assessments. A fifth category is listed to report the number of participants who were missing either a QuantiFERON result or induration assessment. The categories are mutually exclusive. | Day 0 for QuantiFERON; Days 3, 7, and 28 for induration | 
| Number of Participants With QuantiFERON Responses Based on the Presence or Absence of Induration at the Injection Site for the Antigen MLCwA at Doses of 0.1 Microgram. | Blood collection for the QuantiFERON assessment was at Day 0 prior to antigen administration. Participants are considered to have a positive QuantiFERON response if the result was greater than 0. The categories present the number of participants who are positive or negative by QuantiFERON based on whether or not induration was assessed as present at any of the follow up visit assessments. A fifth category is listed to report the number of participants who were missing either a QuantiFERON result or induration assessment. The categories are mutually exclusive. | Day 0 for QuantiFERON; Days 3, 7, and 28 for induration | 
| Number of Participants With QuantiFERON Responses Based on the Presence or Absence of Induration at the Injection Site for the Antigen MLCwA at Doses of 1.0 Microgram. | Blood collection for the QuantiFERON assessment was at Day 0 prior to antigen administration. Participants are considered to have a positive QuantiFERON response if the result was greater than 0. The categories present the number of participants who are positive or negative by QuantiFERON based on whether or not induration was assessed as present at any of the follow up visit assessments. A fifth category is listed to report the number of participants who were missing either a QuantiFERON result or induration assessment. The categories are mutually exclusive. | Day 0 for QuantiFERON; Days 3, 7, and 28 for induration | 
| Number of Participants With QuantiFERON Responses Based on the Presence or Absence of Induration at the Injection Site for the Antigen PPD. | Blood collection for the QuantiFERON assessment was at Day 0 prior to antigen administration. Participants are considered to have a positive QuantiFERON response if the result was greater than 0. The categories present the number of participants who are positive or negative by QuantiFERON based on whether or not induration was assessed as present at any of the follow up visit assessments. A fifth category is listed to report the number of participants who were missing either a QuantiFERON result or induration assessment. The categories are mutually exclusive. | Day 0 for QuantiFERON; Days 3, 7, and 28 for induration | 
| Number of Participants Positive for Phenolic Glycolipid-1 (PGL-1) by QuantiFERON Results and the Presence or Absence of Induration at the Injection Site for the Antigen MLSA-LAM at Doses of 0.1 Microgram | Blood was collected at Day 0 prior to antigen administration for the assessment of PGL-1 and QuantiFERON. The mutually exclusive categories present the number of participants positive or negative by the two assays based on presence of induration at any of the follow up visit assessments. Results for PGL-1 of weakly, moderately or strongly positive are grouped as positive. A result greater than 0 is considered positive for QuantiFERON. A fifth category is listed to report the number of participants who were missing either assay result or the induration assessment. | Day 0 for PGL-1 and QuantiFERON; Days 3, 7, and 28 for induration | 
| Number of Participants Positive for Phenolic Glycolipid-1 (PGL-1) by QuantiFERON Results and the Presence or Absence of Induration at the Injection Site for the Antigen MLSA-LAM at Doses of 1.0 Microgram | Blood was collected at Day 0 prior to antigen administration for the assessment of PGL-1 and QuantiFERON. The mutually exclusive categories present the number of participants positive or negative by the two assays based on presence of induration at any of the follow up visit assessments. Results for PGL-1 of weakly, moderately or strongly positive are grouped as positive. A result greater than 0 is considered positive for QuantiFERON. A fifth category is listed to report the number of participants who were missing either assay result or the induration assessment. | Day 0 for PGL-1 and QuantiFERON; Days 3, 7, and 28 for induration | 
| Number of Participants Positive for Phenolic Glycolipid-1 (PGL-1) by QuantiFERON Results and the Presence or Absence of Induration at the Injection Site for the Antigen MLCwA at Doses of 0.1 Microgram | Blood was collected at Day 0 prior to antigen administration for the assessment of PGL-1 and QuantiFERON. The mutually exclusive categories present the number of participants positive or negative by the two assays based on presence of induration at any of the follow up visit assessments. Results for PGL-1 of weakly, moderately or strongly positive are grouped as positive. A result greater than 0 is considered positive for QuantiFERON. A fifth category is listed to report the number of participants who were missing either assay result or the induration assessment. | Day 0 for PGL-1 and QuantiFERON; Days 3, 7, and 28 for induration | 
| Number of Participants Positive for Phenolic Glycolipid-1 (PGL-1) by QuantiFERON Results and the Presence or Absence of Induration at the Injection Site for the Antigen MLCwA at Doses of 1.0 Microgram | Blood was collected at Day 0 prior to antigen administration for the assessment of PGL-1 and QuantiFERON. The mutually exclusive categories present the number of participants positive or negative by the two assays based on presence of induration at any of the follow up visit assessments. Results for PGL-1 of weakly, moderately or strongly positive are grouped as positive. A result greater than 0 is considered positive for QuantiFERON. A fifth category is listed to report the number of participants who were missing either assay result or the induration assessment. | Day 0 for PGL-1 and QuantiFERON; Days 3, 7, and 28 for induration | 
| Number of Participants Positive for Phenolic Glycolipid-1 (PGL-1) by QuantiFERON Results and the Presence or Absence of Induration at the Injection Site for the Antigen PPD | Blood was collected at Day 0 prior to antigen administration for the assessment of PGL-1 and QuantiFERON. The mutually exclusive categories present the number of participants positive or negative by the two assays based on presence of induration at any of the follow up visit assessments. Results for PGL-1 of weakly, moderately or strongly positive are grouped as positive. A result greater than 0 is considered positive for QuantiFERON. A fifth category is listed to report the number of participants who were missing either assay result or the induration assessment. | Day 0 for PGL-1 and QuantiFERON; Days 3, 7, and 28 for induration | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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leprosy, Mycobacterium leprae, Hansen's Disease, skin test, Nepal