Respiratory virus infections.
D000293:Adolescent; D002648:Child; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology; D012136:Respiratory Syncytial Viruses / Q000302:isolation & purification; D012141:Respiratory Tract Infections / Q000209:etiology*; D013290:Streptococcal Infections; D014777:Virus Diseases / Q000453:epidemiology*; D014887:Weather