Eligibility Criteria:
Inclusion Criteria:
* Males or nonpregnant females, age 18 to 70 years
* Negligible risk of manifesting a positive PPD test as evidenced by:
* Prior history of negative PPD test or interferon gamma release assay (IGRA) within 14 months before Screening
* No history of Bacillus Calmette- Guérin vaccination; or if vaccination status is uncertain, was born in the US and did not live outside the US as a child
* No history of Mtb or Mtb therapy (including isoniazid, rifampin, ethambutol, pyrazinamide, or streptomycin)
* No history of infection with atypical mycobacteria, including suspicious chest roentgenogram
* No history of high risk medical conditions (eg, HIV infection or other immunosuppressive conditions, severe chronic renal disease \[as evidenced by a creatinine clearance \< 30 ml/min\], poorly controlled diabetes mellitus, silicosis, intravenous drug use, or alcohol abuse)
* No known close contact to a confirmed Mtb case (family or social setting)
* No history of living or travelling in India, China, Sub-Saharan Africa, or Southeast Asia in the past 6 months
* No exposure (other than casual) to high-risk environments for Mtb exposure (eg, prisons, homeless shelters); healthcare workers are allowed
Exclusion Criteria:
* Subject is of childbearing potential and unable to use contraceptives; is planning pregnancy; is pregnant or lactating
* History of anaphylactic type reaction or other severe reaction to PPD in the past, including a history of blistering or sloughing
* Presence of conditions that may suppress TST reactivity, including:
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* Acute viral infections, including measles, mumps, chicken pox, human immunodeficiency virus (HIV1, HIV2). Mild viral syndromes are allowed.
* Acute bacterial infections including typhoid fever, brucellosis, typhus, leprosy, or pertussis
* Acute systemic fungal infection
* Live virus vaccinations within the past 6 weeks, including measles, mumps, polio, varicella, or FluMist®
* Metabolic derangements (eg, poorly controlled diabetes, Cushing syndrome, chronic renal failure \[as evidenced by a creatinine clearance \< 30 ml/min\])