Penicillin Resistance of Nonvaccine Type Pneumococcus before and after PCV13 Introduction, United States. Author(s): Andam CP, Worby CJ, Gierke R, McGee L, Pilishvili T, Hanage WP|Journal: Emerg Infect Dis|PMID: 28518018| June 2017 Introduction of 13-valent pneumococcal conjugate vaccine in the United States was not associated with a significant change in prevalence of…