[Etiology of respiratory tract infections in children].
D000367:Age Factors; D001424:Bacterial Infections; D002675:Child, Preschool; D004196:Disease Outbreaks / Q000209:etiology; D006801:Humans; D012141:Respiratory Tract Infections / Q000209:etiology*; D014777:Virus Diseases
Zur Atiologie respiratorischer Infekte im Kindesalter