Respiratory syncytial virus infection.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008875:Middle Aged; D012136:Respiratory Syncytial Viruses / Q000472:pathogenicity*; D012141:Respiratory Tract Infections / Q000276:immunology*