4.5 Article

Changes in Bronchiolitis Incidence During the Last Two Decades in Tampere, Finland: A Retrospective Study

期刊

PEDIATRIC INFECTIOUS DISEASE JOURNAL
卷 41, 期 11, 页码 867-871

出版社

LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/INF.0000000000003662

关键词

Bronchiolitis; incidence; infant; epidemiology; respiratory syncytial virus

资金

  1. Tampere University Hospital

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The incidence of bronchiolitis hospitalization has changed in Tampere, Finland over the past two decades, with higher incidence peaks and a shift towards spring.
Background: Bronchiolitis, a lower respiratory tract infection, causes a remarkable number of hospitalizations globally. The epidemiology follows the same pattern as respiratory syncytial virus (RSV), the most common pathogen in bronchiolitis. Epidemics have typically followed a biannual pattern in Nordic countries-first, a small epidemic during spring, followed by a higher peak the next autumn. The aim of this study was to evaluate whether the incidence of bronchiolitis hospitalization has changed during the last 2 decades in Tampere, Finland. Methods: In this retrospective register-based study, data on infants <12 months of age hospitalized with bronchiolitis in 2000-2019 were collected from electronic files of Tampere University Hospital and analyzed by monthly incidences. Additionally, data on RSV incidences were collected from the Finnish National Infectious Diseases Register for children Results: Of the 1481 infants hospitalized with bronchiolitis, 82.0% had a diagnosis of RSV bronchiolitis. At first, bronchiolitis' epidemiological pattern followed its typical biannual pattern, then shifted to annual in the middle of the study period, and thereafter occurred biannually again. The highest incidence rate ratios compared to the low-incidence months were between December (22.5), January (25.8) and February (25.5) in 2000-2006, and between February (24.7), March (25.1) and April (21.0) in 2007-2019. Conclusions: The epidemiological pattern of bronchiolitis changed during the study period; incidence peaks were higher and have shifted toward spring in recent years.

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