Association between pronounced IgA response in RSV bronchiolitis and development of allergic sensitization

Forty‐five children who had heen hospitalized with bronchiolitis caused by respiratory syncytial virus (RSV) at a mean age of 4 months, and 90 matched control children, were tested for occurrence of RSV antibodies at one year of age. Of the children who had suffered from bronchiolitis. forty had demonstrable IgG antibodies, whereas the remaining five only had IgA antibodies against RSV. In the control group. 42% were RSV seropositive. The anti‐RSV IgA antibody titres tended to be higher in patients with bronchiolitis ihan in controls and a larger proportion of the seropositive children in the former than in the latter group had demonstrable IgG antibodies. These fmdings suggest that RSV infections causing bronchiolitis are more often associated with a strong antibody response than are mild cases of the infection.

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