TST will be analyzed in young general population in Korea. Young adults undertake TST as CDC recommendation. Participants with chest radiograph showing active TB lesion are excluded from this study.
Enroll criteria * A term of whole military conscripts per year in one Reserve Force Battalion * Military conscripts gather from all around area in Korea randomly * Each participant undertake a chest X-ray (CXR) and blood tests including human immunodeficiency virus (HIV) at the start of initiatory training. Exclusion Criteria * Chest X-ray suggesting active TB * HIV positive in serology Design * After giving informed consent, all participants receive one-step TST following standard procedures. * The largest transverse diameter of induration is measured 48-72hr after injection. * The investigator and these trained nurses were blinded to the status of their demographic characteristics.
Study Type
OBSERVATIONAL
Enrollment
5,552
The Korean Institute of Tuberculosis
Osong, North Chungcheong, South Korea
TST positivity TST rate
Investigators measure induration size of tuberculin skin test 48 after tuberculin injection.
Time frame: Two days after tuberculin injection
BCG scar rates
Time frame: The day of tuberculin injection
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