Acute infection of the lower respiratory tract in children.
D000208:Acute Disease; D000293:Adolescent; D001344:Autopsy; D002648:Child; D002675:Child, Preschool; D004200:Diseases in Twins; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008168:Lung / Q000473:pathology; D011650:Pulmonary Alveoli / Q000473:pathology; D012141:Respiratory Tract Infections / Q000401:mortality / Q000473:pathology