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Background England is experiencing a rapid increase in invasive pneumococcal disease (IPD) caused by serotypes 8, 12F, and 9N; their clinical characteristics and outcomes have not been described. Methods Public Health England conducts national IPD surveillance. Cases due to emerging serotypes were compared with those included in the 13-valent pneumococcal conjugate vaccine (PCV13) and the remaining non-PCV13 serotypes. Results There were 21 592 IPD cases during 2014–15 to 2017–18, including 20 108 (93.1%) with serotyped isolates and 17 450 (86.8%) with completed questionnaires. PCV13 serotypes were responsible for 20.1% (n = 4033), while serotype 8 (3881/20 108 [19.3%]), 12F (2365/20 108 [11.8%]), and 9N (1 296/20 108 [6.4%]) were together responsible for 37.5% of cases. Invasive pneumonia was the most common presentation (11 424/16 346 [69.9%]) and, overall, 67.0% (n = 11 033) had an underlying comorbidity. The median age (interquartile range) at IPD due to serotypes 8 (59 [45–72] years) and 12F (56 [41–70] years) was lower than serotype 9N (67 [53–80] years), PCV13 serotypes (68 [52–81] years), and remaining non-PCV13 serotypes (70 [53–82] years). Serotype 9N IPD cases also had higher comorbidity prevalence (748/1087 [68.8%]) compared to serotype 8 (1901/3228 [58.9%]) or 12F (1042/1994 [52.3%]), and higher case fatality (212/1128 [18.8%]) compared to 8.6% (291/3365) or 10.0% (209/2086), respectively. Conclusions Serotypes 8 and 12F were more likely to cause IPD in younger, healthier individuals and less likely to be fatal, while serotype 9N affected older adults with comorbidities and had higher case fatality.

clinical infectious diseases/clinical infectious diseases (online. university of chicago. press)

Characteristics of Invasive Pneumococcal Disease Caused by Emerging Serotypes After the Introduction of the 13-Valent Pneumococcal Conjugate Vaccine in England: A Prospective Observational Cohort Study, 2014–2018