[Surveillance of acute respiratory infections in three kindergartens of Beijing].
D002648:Child; D002675:Child, Preschool; D002681:China; D006801:Humans; D007223:Infant; D009980:Influenza A virus / Q000302:isolation & purification; D009724:Nurseries, Infant; D011014:Pneumonia / Q000453:epidemiology; D012136:Respiratory Syncytial Viruses / Q000302:isolation & purification; D012141:Respiratory Tract Infections / Q000453:epidemiology* / Q000382:microbiology