Recurrent respiratory tract infection.
D000328:Adult; D001249:Asthma / Q000175:diagnosis / Q000188:drug therapy; D001991:Bronchitis / Q000175:diagnosis / Q000209:etiology / Q000517:prevention & control; D002648:Child; D002675:Child, Preschool; D003371:Cough / Q000175:diagnosis; D006801:Humans; D007223:Infant; D012008:Recurrence; D012141:Respiratory Tract Infections / Q000175:diagnosis / Q000628:therapy; D014777:Virus Diseases / Q000628:therapy