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Contribution of different population age strata (grouped into four colours) to the vaccine type infection pressure in each age stratum (y-axis), stratified by settings Kilifi, England and Wales (EW), Nha Trang (NT) and Finland (Fin). For example, the dominance of green in a specific stacked bar indicates that among the vaccine type pneumococcal infections in this age group and this setting most stem from pre-school-aged children
