National Center for Biotechnology Information NCBI NLM MEDLINE animals humans pubmed abstract nih national institutes of health national library of medicine research support non-u.s. gov't u.s. gov't adult female male adolescent middle aged Child Infant P.H.S. preschool Clinical Trial Randomized Controlled Trial Antibodies Double-Blind Method cell line Viral / analysis mutation respiratory syncytial viruses / immunology* viral / blood vaccines attenuated / immunology b r murphy respiratory syncytial virus infections / immunology* viral / biosynthesis* respiratory syncytial viruses / genetics respiratory syncytial viruses / pathogenicity mutagenesis viral vaccines / immunology* pmid:9395351 doi:10.1086/514138 r a karron p f wright fluorouracil nasal lavage fluid / immunology nasal lavage fluid / virology pan troglodytes respiratory syncytial virus infections / transmission