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Letter
Outcome after bronchiolitis depends on disease definition
  1. M Hyvärinen1,
  2. M Ruotsalainen1,
  3. M Korppi2
  1. 1Department of Pediatrics, Kuopio University and University Hospital, Kuopio, Finland
  2. 2Paediatric Research Centre, Tampere University and University Hospital, Tampere, Finland
  1. Correspondence to Professor Matti Korppi, Paediatric Research Centre, Tampere University and University Hospital, FinMed-3 Building, 33014 Tampere University, Finland; matti.korppi{at}uta.fi

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Sigurs et al recently published their 18-year prospective controlled follow-up study of 47 subjects hospitalised for respiratory syncytial virus (RSV) bronchiolitis at age <12 months.1 In the cohort the prevalence of wheezing and asthma was higher than in population-based controls at 3, 7 and 13 years of age.

Asthma was present, depending on definition, in 33–39% of 46 study subjects and in 7–9% of 92 controls,1 in line with an asthma prevalence of 9.5% in Swedish young adults.2 The risk of adulthood asthma after RSV bronchiolitis was therefore 3.5–4.1-fold compared with …

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    N Sigurs F Aljassim B Kjellman P D Robinson F Sigurbergsson R Bjarnason P M Gustafsson