Chemoprophylaxis for tuberculosis.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D006801:Humans; D007538:Isoniazid / Q000009:adverse effects / Q000627:therapeutic use*; D008875:Middle Aged; D014374:Tuberculin Test; D014376:Tuberculosis / Q000517:prevention & control*
D007538:Isoniazid