| respiratory syncytial virus infection in hospitalized patients and healthy children in el salvador. | nasopharyngeal specimens from 42 children less than one-year old hospitalized with bronchiolitis or pneumonia in el salvador were analyzed for the presence of subgroup-specific respiratory syncytial virus (rsv) antigens by the indirect immunofluorescence technique. the antigen rsv-a was demonstrated in 28 children, rsv-b in three, and in one child subgroup, specificity could not be determined. the male:female ratio in the rsv-infected children was 1.9:1. the most severe disease, requiring intens ... | 1994 | 7985749 |