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Clustering of acute respiratory infection hospitalizations in childcare facilities

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Abstract Aim: 

To estimate how risk of acute respiratory infection (ARI) hospitalization in children attending childcare facilities with a recently (within 1 month) hospitalized child is affected by gender, age and other characteristics. Methods: 

Population-based prospective cohort study of 436 434 Danish 0–5-year-old children attending childcare during 1989–2004. Information was collected from Danish registers. Main outcome measure was incidence rate ratios (IRRs) of in-patient hospitalization for ARI. Results: 

During 1 777 999 person-years of follow-up 42 681 hospitalizations for ARI occurred, of which 362 (1%) occurred within 1 month after another child was hospitalized for ARI in the facility. Children attending a facility with a recent ARI hospitalization had an increased risk of 42% (95% CI 27%;60%) compared with other children. The increased risk was higher in 0–2-year-old children than in 3–5-year-old children (55% vs 17%, p = 0.02) and if the latest hospitalized child was 0–2 years rather than 3–5 years (52% vs 19%, p = 0.04). The increased risk was similar in boys and girls, but was higher if the latest hospitalized child was a boy rather than a girl (52% vs 13%, p = 0.02). Conclusion: 

Although occurring infrequently, clustering of ARI hospitalizations involve 0–2-year-olds and boys as first hospitalized child relatively more often than would be expected.
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Keywords: Childcare; Clustering; Respiratory infection

Document Type: Research Article

Affiliations: 1: Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark 2: Bandim Health Project, Statens Serum Institut, Copenhagen, Denmark 3: Department of Pediatrics, Herning Central Hospital, Copenhagen, Denmark

Publication date: 01 June 2010

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