Sniffly schoolchildren.
D002675:Child, Preschool; D006801:Humans; D008131:London; D009975:Orthomyxoviridae / Q000302:isolation & purification; D012141:Respiratory Tract Infections / Q000453:epidemiology / Q000209:etiology*; D012229:Rhinovirus / Q000302:isolation & purification; D012572:School Health Services; D012698:Serologic Tests; D014780:Viruses / Q000302:isolation & purification*