National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine logistic models adult female male adolescent aged middle aged united states / epidemiology risk factors Retrospective Studies Respiratory Tract Infections / virology* immunocompromised host pneumonia multivariate analysis respiratory tract infections / prevention & control respiratory tract infections / mortality hematopoietic stem cell transplantation / adverse effects* viral / mortality respiratory syncytial virus infections / mortality respiratory tract infections / epidemiology* influenza human / prevention & control respiratory syncytial virus infections / prevention & control viral / virology virus diseases / epidemiology* virus diseases / mortality virus diseases / prevention & control community-acquired infections / virology viral / epidemiology* human / virology virus diseases / etiology viral / etiology respiratory syncytial virus infections / etiology paramyxoviridae infections / prevention & control human / mortality roy f chemaly issam i raad pmid:16974212 doi:10.1097/01.md.0000232560.22098.4e shubhra ghosh hematologic neoplasms / virology* human / etiology paramyxoviridae infections / etiology paramyxoviridae infections / mortality viral / prevention & control