title: Respiratory syncytial virus neutralizing activity in nasal secretions following natural infection.
mesh_terms: D000917:Antibody Formation; D002675:Child, Preschool; D003168:Complement Fixation Tests; D006801:Humans; D005779:Immunodiffusion; D007223:Infant; D008722:Methods; D009297:Nasal Mucosa / Q000378:metabolism*; D012136:Respiratory Syncytial Viruses / Q000276:immunology*; D012141:Respiratory Tract Infections / Q000276:immunology*