Letter: Massive use of chemoprophylaxis against tuberculosis.
D001500:BCG Vaccine; D002648:Child; D006801:Humans; D007538:Isoniazid / Q000009:adverse effects / Q000627:therapeutic use*; D014376:Tuberculosis / Q000517:prevention & control*; D014397:Tuberculosis, Pulmonary / Q000517:prevention & control
D001500:BCG Vaccine; D007538:Isoniazid