Penicillin Resistance of Nonvaccine Type Pneumococcus before and after PCV13 Introduction, United States
OPEN Emerging infectious diseases | 19 May 2017
CP Andam, CJ Worby, R Gierke, L McGee, T Pilishvili and WP Hanage
Introduction of 13-valent pneumococcal conjugate vaccine in the United States was not associated with a significant change in prevalence of penicillin resistance in nonvaccine type serotypes because of the variable success of highly resistant serotypes. Differences in regional serotype distribution and serotype-specific resistance contributed to geographic heterogeneity of penicillin resistance.
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