[Bronchiolitis caused by respiratory syncytial virus in very young infants and transmitted maternal antibodies].

The study with an Enzyme Linked Immunosorbent Assay of the sera of 57 infants aged less than 9 weeks and developing a bronchiolitis, argues for the absence of a protective role for the maternally transmitted anti-respiratory syncytial virus (RSV) IgG and for the existence of a positive relationship between these antibodies levels - which are not neutralizing - and the severity of RSV bronchiolitis.