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Impact of the 10-valent pneumococcal conjugate vaccine on hospital admissions in children under three years of age in Iceland.

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Authors
Sigurdsson, Samuel
Eythorsson, Elias
Erlendsdóttir, Helga
Hrafnkelsson, Birgir
Kristinsson, Karl G
Haraldsson, Ásgeir
Issue Date
2020-02-13

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Sigurdsson S, Eythorsson E, Erlendsdóttir H, Hrafnkelsson B, Kristinsson KG, Haraldsson Á. Impact of the 10-valent pneumococcal conjugate vaccine on hospital admissions in children under three years of age in Iceland. Vaccine. 2020;38(12):2707–2714. doi:10.1016/j.vaccine.2020.01.094
Abstract
Introduction: Pneumococcus is an important respiratory pathogen. The 10-valent pneumococcal vaccine (PHiD-CV) was introduced into the Icelandic vaccination programme in 2011. The aim was to estimate the impact of PHiD-CV on paediatric hospitalisations for respiratory tract infections and invasive disease. Methods: The 2005-2015 birth-cohorts were followed until three years of age and hospitalisations were recorded for invasive pneumococcal disease (IPD), meningitis, sepsis, pneumonia and otitis media. Hospitalisations for upper- and lower respiratory tract infections (URTI, LRTI) were used as comparators. The 2005-2010 birth-cohorts were defined as vaccine non-eligible cohorts (VNEC) and 2011-2015 birth-cohorts as vaccine eligible cohorts (VEC). Incidence rates (IR) were estimated for diagnoses, birth-cohorts and age groups, and incidence rate ratios (IRR) between VNEC and VEC were calculated assuming Poisson variance. Cox regression was used to estimate the hazard ratio (HR) of hospitalisation between VNEC and VEC. Results: 51,264 children were followed for 142,315 person-years, accumulating 1,703 hospitalisations for the respective study diagnoses. Hospitalisations for pneumonia decreased by 20% (HR 0.80, 95%CI:0.67-0.95) despite a 32% increase in admissions for LRTI (HR 1.32, 95%CI:1.14-1.53). Hospital admissions for culture-confirmed IPD decreased by 93% (HR 0.07, 95%CI:0.01-0.50) and no hospitalisations for IPD with vaccine-type pneumococci were observed in the VEC. Hospitalisations for meningitis and sepsis did not change. A decrease in hospital admissions for otitis media was observed, but did not coincide with PHiD-CV introduction. Conclusion: Following the introduction of PHiD-CV in Iceland, hospitalisations for pneumonia and culture confirmed IPD decreased. Admissions for other LRTIs and URTIs increased during this period.
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https://www.sciencedirect.com/science/article/pii/S0264410X2030147X?via%3Dihub
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Copyright © 2020. Published by Elsevier Ltd.
ae974a485f413a2113503eed53cd6c53
10.1016/j.vaccine.2020.01.094
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