Letter: Massive use of chemoprophylaxis against tuberculosis.
D001500:BCG Vaccine; D006801:Humans; D007538:Isoniazid / Q000627:therapeutic use*; D014374:Tuberculin Test; D014376:Tuberculosis / Q000175:diagnosis / Q000517:prevention & control*
D001500:BCG Vaccine; D007538:Isoniazid