[Indices of the humoral response to respiratory syncytial virus infection in children with acute bronchitis].

Examinations of 30 children with acute bronchitis have revealed a respiratory syncytial (RS) viral infection in 18. A reduced response to RS virus was seen in patients with bronchitis complicated by obstruction, in contrast to that in cases without obstruction. Humoral response to this virus was reduced and delayed in younger children as against that in elder ones. Even high levels of specific IgG did not result in vitro neutralization of RS virus.