Influenza and its complications. I.
D000328:Adult; D000368:Aged; D001990:Bronchiolitis, Viral; D001991:Bronchitis / Q000209:etiology; D002648:Child; D006801:Humans; D007251:Influenza, Human / Q000150:complications*; D007829:Laryngostenosis / Q000209:etiology; D008875:Middle Aged; D011024:Pneumonia, Viral / Q000209:etiology*; D012141:Respiratory Tract Infections / Q000209:etiology*; D013203:Staphylococcal Infections / Q000150:complications; D014135:Tracheal Stenosis / Q000209:etiology; D014136:Tracheitis / Q000209:etiology