[Virological and serological study of acute respiratory tract infections in children].
D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D012141:Respiratory Tract Infections / Q000276:immunology* / Q000382:microbiology; D014780:Viruses / Q000302:isolation & purification*