A study to determine bioequivalence of PPD material versus Reference Standard.

This study is a multicenter, double-blind, active-controlled parallel-group study to determine the bioequivalence of newly produced PPD material versus PPD-S2 in the detection of male and female subjects with current or previously diagnosed intrathoracic Mtb infection, as documented by a positive culture for Mtb (preferred method), by their primary care or attending physician and/or by the subject's current or prior medical records (ie, sensitivity determination).

Inclusion Criteria:

1. Males or nonpregnant females age 18 to 60 years
2. Documented PPD reactivity of 5 to 21 mm in the past, documented in a medical record. Self-reported PPD reactivity will be acc
3. Give written informed consent to participate
4. Generally healthy, as determined by medical history and targeted physical examination, if indicated
5. Possess 2 forearms that are free of burns, scars, eczema, or any physical deformity, which could impair injection of study prepar
6. Comprehension of the study requirements; expressed availability for the required study period, including readings at the nomina

Exclusion Criteria:

1. Prior PPD test within the past 30 days
2. Subject is of childbearing potential and unable to use contraceptives; is planning pregnancy; is pregnant or lactating
3. History of anaphylactic reaction, severe positive tuberculin reaction (eg, ulceration, necrosis) or other severe reaction to PPD in
4. Subject received a Bacillus Calmette-Guérin (BCG) vaccination in the past, or was born or lived outside the US as a child and is
5. Presence of conditions that may suppress TST reactivity -