Public health impact of pneumococcal conjugate vaccine infant immunization programs: assessment of invasive pneumococcal disease burden and serotype distribution.

Abstract:

INTRODUCTION:Pneumococcal conjugate vaccine (PCV) impact studies have reported substantial reductions in the incidence of invasive pneumococcal disease (IPD) after implementation of childhood PCV programs. Heterogeneity in surveillance systems, local epidemiology and PCV programs hampers comparisons between studies. We aimed to better understand the impact of childhood PCV programs on overall IPD and serotype distribution. AREAS COVERED:We analyzed the impact of PCV programs on the incidence of overall IPD, and the distribution of vaccine serotypes (VT) and non-vaccine serotypes (NVT) in children <5 years and adults ≥65 years old. We retrieved datasets from observational post-marketing studies and surveillance reports from countries with high-quality surveillance data available for at least 2 years before PCV program initiation and 3 years after higher-valent PCV implementation. We harmonized pre- and post-PCV analysis periods and assessment methods. EXPERT COMMENTARY:After introduction of pediatric PCV programs, the residual overall IPD burden in children was low and in a narrow range across countries with high vaccination coverage, irrespective of differences in PCV programs and pneumococcal epidemiology. Effects on overall IPD were more variable in the elderly. Whereas IPD was mainly due to VTs before PCV introduction, NVTs are the major contributor today in children and adults.

journal_name

Expert Rev Vaccines

authors

Izurieta P,Bahety P,Adegbola R,Clarke C,Hoet B

doi

10.1080/14760584.2018.1413354

subject

Has Abstract

pub_date

2018-06-01 00:00:00

pages

479-493

issue

6

eissn

1476-0584

issn

1744-8395

journal_volume

17

pub_type

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