The most compelling evidence for this link is from studies (community-randomized trials or pre- and
post-PCV observational Z VAD FMK studies) simultaneously examining rates of VT-carriage and VT-IPD in non-targeted groups, with and without PCV. Also relevant are studies examining PCV-associated changes in IPD or carriage alone. Others that provide secondary supporting evidence for the validity of the causal chain include studies comparing VT-IPD or NP carriage rates in non-targeted age-groups in early vs. mature post-introduction periods (time-series analyses); those comparing these rates pre- and post-introduction in populations which are predominantly non-targeted but include some targeted individuals (“mixed” populations); and those which compare pre- and post- introduction rates of all-type (AT) IPD in non-target age-groups without distinguishing VT from NVT
disease. We performed a comprehensive review of studies meeting each of these descriptions to assess the evidence for the importance of NP carriage as a component of licensure of new pediatric pneumococcal vaccine products. A literature review through 2005 of the PCV indirect effect on IPD has been published. [17] We performed a comprehensive literature search for the PCV Dosing Landscape Project that identified PCV observational and interventional studies with respect to immunogenicity, IPD, pneumonia and NP carriage that updated the evidence through September 2010 and added changes in carriage [18]. A subsequent literature search was performed in January 2013 to identify articles with primary evidence published after the PCV Dosing Landscape Project search; these this website results
are reported separately from the main analyses. Articles identified by double-abstract screening that reported data on NP carriage and IPD in non-targeted age-groups were included. Review articles and book chapters were reviewed for additional citations. Appendix B.1 describes the literature ever review methodology. Primary evidence: Articles were included as primary evidence if they reported both pre- and post-PCV introduction periods, distinguished VT from NVT isolates, and provided results on non-targeted age-groups. Supporting evidence: Papers were considered for supporting evidence if they reported on a population, age range or year not included in the primary evidence. The following hierarchy based on descending relevance was used: 1. Data comparing early vs. late post-introduction (rather than pre vs. post-introduction) periods. Data on mixed targeted and non-targeted (rather than pure non-targeted) age-groups. This includes settings with catch-up schedules (see Appendix B.1 for the variant abstraction technique used). We abstracted the PCV product and schedule, contemporaneous vaccine coverage, age range of non-targeted population, VT-IPD case counts, incidences or proportions, and VT-carriage numbers and proportions. IPD was defined as isolation of S.
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