Amin-Chowdhury Z, Collins S, Sheppard C, Litt D, et al. Characteristics of invasive pneumococcal disease (IPD) caused by emerging
serotypes after the introduction of the 13-valent pneumococcal conjugate vaccine
(PCV13) in England; prospective observational cohort study, 2014-18. Clin Infect Dis 2020 Jan 19. pii: 5709629. doi: 10.1093.
PMID: 31955196