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To the Editor.
Asthma is caused by several hereditary and environmental factors. It was recently shown that respiratory syncytial virus (RSV) bronchiolitis during the first year of life increases the risk of asthma.1 Children with RSV bronchiolitis had a significantly higher incidence of asthma at 3 years of age than children matched for birth date, sex, and residency (11/47 versus 1/93). This leads to the question whether other serious respiratory infections also increase the risk of asthma. The aim of the present study was to compare the occurrence of asthma in 4-year-old children with pertussis during the first year of life with children who had not had pertussis before …
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