Predictors of sub-clinical enterovirus infections in infants: a prospective cohort study

International Journal of Epidemiology
E WitsøK S Rønningen

Abstract

Enterovirus infections are common, although most often sub-clinical. The present purpose was to assess the impact of breastfeeding and other factors on enterovirus infections in infancy. A prospective observational study was carried out on a population-based cohort of 639 Norwegian infants aged 3-12 months. The outcome was enterovirus RNA measured in monthly stool samples. Data on underlying determinants, such as dietary feeding and household factors, were reported in parental questionnaires. Multivariable logistic regression was performed to allow for common confounders. Statistical analyses were performed by GLLAMM using Stata 9.2, which corrects for subject-specific random effects. The prevalence of enterovirus in stools was 11.1% (475/4279). Risk of enterovirus infection decreased with increasing number of daily breastfeeds; the effect was most pronounced at the age of 3 months [odds ratio (OR), 0.85; 95% confidence interval (CI) 0.8-0.9, P < 0.001], gradually declining thereafter, reaching no effect at 11 months. Increased risk was associated with having one or more sibling(s) (OR 1.89; 95% CI 1.2-3.0), particularly if they attended daycare (OR 2.46; 95% CI 1.4-4.2), and with increasing exposure to other children (OR 1.04;...Continue Reading

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