title: Introduction.
authors.affiliation: Department of Pathology, University of Virginia, Charlottesville, USA.
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Braciale
authors.forename: John J
authors.initials: JJ
authors.lastname: Treanor
mesh_terms: D017677:Age Distribution; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003140:Communicable Disease Control; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D008297:Male; D018357:Respiratory Syncytial Virus Infections / Q000453:epidemiology / Q000517:prevention & control*; D012141:Respiratory Tract Infections / Q000453:epidemiology / Q000821:virology*; D018570:Risk Assessment; D017678:Sex Distribution; D014481:United States / Q000453:epidemiology