Cookies on this website

We use cookies to ensure that we give you the best experience on our website. If you click 'Accept all cookies' we'll assume that you are happy to receive all cookies and you won't see this message again. If you click 'Reject all non-essential cookies' only necessary cookies providing core functionality such as security, network management, and accessibility will be enabled. Click 'Find out more' for information on how to change your cookie settings.

BACKGROUND: Monitoring changes in pharyngeal carriage of pneumococcus in children following 13-valent pneumococcal conjugate vaccine (PCV13) introduction in the UK in 2010 informs understanding of patterns of invasive pneumococcal disease (IPD) incidence. METHODS: Nasopharyngeal swabs from healthy children vaccinated with PCV13 according to schedule (2, 4, 12 months) were cultured and serotyped. Results for children aged 13-48 months were compared between 2014/15 and 2017/19, and with children aged 6-12 months (2017/20). Blood was obtained from a subset of children for pneumococcal serotype-specific IgG. RESULTS: Total pneumococcal carriage at 13-48 months was 47.9% (473/988) in 2014/15 and 51.8% (412/795) in 2017/19 (p = 0.10); at age 6-12 months this value was 44.6% (274/615). In 2017/19, 2.9% (95% CI 1.8-4.3%) of children aged 13-48 months carried PCV13 serotypes (mainly 3 (1.5%) and 19A (0.8%)) and over 20% carried the additional PCV20 serotypes. Similar proportions of children had IgG ≥0.35 IU/mL for each serotype in 2014/15 and 2017/19.Serotype 7C carriage increased significantly (p 

Original publication




Journal article


J Infect Dis

Publication Date



IPD, PCV, Pneumococcal, carriage, conjugate, invasive, nasopharyngeal, serotype, vaccine