BCG vaccines (1) Teenagers (1) Tuberculosis (1) Tuberculin (1) Students (1) School children (1) Proportion (1) Mycobacterial diseases (1) Health (1) Vacuna BCG (1) Tuberculina (1) Salud (1) Enfermedades micobacterianas (1) Estudio (1) Estudiantes (1) Tuberculosis (1) Escolares (1) Adolescentes (1) Proporción (1)