Persistent circulation of vaccine serotypes and serotype replacement after 5 years of infant immunization with 13-valent pneumococcal conjugate vaccine in the United Kingdom

Rama Kandasamy*, Merryn Voysey, Sarah Collins, Guy Berbers, Hannah Robinson, Irene Noel, Harri Hughes, Susan Ndimah, Katherine Gould, Norman Fry, Carmen Sheppard, Shamez Ladhani, Matthew D. Snape, Jason Hinds, Andrew J. Pollard

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

Background: Following programmatic introduction of the 13-valent pneumococcal conjugate vaccine (PCV13), there is residual carriage and disease due to PCV13-covered serotypes.

Methods. PCV13-immunized children aged 13-48 months, N = 988, were enrolled between February 2014 and August 2015 (“late PCV13”), and had nasopharyngeal pneumococcal carriage compared with 7-valent pneumococcal conjugate vaccine (PCV7) immunized children, N = 567, enrolled between November 2010 and September 2011 (“early PCV13”). Nasopharyngeal pneumococci were molecularserotyped by microarray. Invasive pneumococcal disease (IPD) cases were identified through enhanced national surveillance.

Results. Compared with PCV7-immunized children, carriage among PCV13-immunized children was significantly lower for serotypes 19A (odds ratio [OR], 0.08 [95% confidence interval {CI},.02-.25]), 6C (OR, 0.11 [95% CI,.03-.32]), and 7F (8 vs 0 cases). IPD incidence in children <5 years was significantly lower for serotypes 1 (incidence rate ratio [IRR], 0.03 [95% CI, 0-.19]) and 7F (IRR, 0.13 [95% CI,.05-.36]) but not 19A (IRR, 0.6 [95% CI,.3-1.12]) or serotype 3 (IRR, 2.3 [95% CI,.86-6.15]) in the late PCV13 period than in the early PCV13 period. The most significant rises in IPD incidence were for serotypes 8, 12F, and 24F.

Conclusions. PCV13 has reduced serotype 19A carriage among vaccinated children. We found no impact of PCV13 on serotype 3 carriage or disease, and emergence of non-PCV13-serotype disease.

Original languageEnglish
Pages (from-to)1361-1370
Number of pages10
JournalJournal of Infectious Diseases
Volume221
Issue number8
DOIs
Publication statusPublished - 10 Jun 2020

Bibliographical note

Funding Information: This work was supported by an Investigator-Initiated Grant from Pfizer UK and the National Institute for Health Research. A. J. P. has previously conducted vaccine studies on behalf of Oxford University that were sponsored by manufacturers of pneumococcal vaccines. The University of Oxford received unrestricted educational grants from pneumococcal vaccine manufacturers in 2016. This study was funded by an investigator-initiated grant to Oxford University. A. J. P. is chair of the Department of Health’s Joint Committee on Vaccination and Immunisation, but the views expressed herein do not represent necessarily those of these organizations. He is also a member of the World Health Organization’s Strategic Advisory Group of Experts. R. K. received the Robert Austrian Award in Pneumococcal Vaccinology, which was supported by Pfizer, at the 10th International Symposium on Pneumococci and Pneumococcal Diseases 2016. M. D. S. is an investigator on studies conducted on behalf of the University of Oxford that are sponsored and/or funded by vaccine manufacturers including Pfizer, GlaxoSmithKline, Janssen, Novavax, and MedImmune. Prior to 2017, M. D. S. spoke at industry-sponsored symposia and attended advisory boards; payment for these activities was made to the University of Oxford and M. D. S. received no personal financial benefit from these activities. All other authors report no potential conflicts of interest. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Conflicts that the editors consider relevant to the content of the manuscript have been disclosed.

Open Access: Free to read, but no Open Access licence.

Publisher Copyright:© The Author(s) 2019.

Citation:

Rama Kandasamy, Merryn Voysey, Sarah Collins, Guy Berbers, Hannah Robinson, Irene Noel, Harri Hughes, Susan Ndimah, Katherine Gould, Norman Fry, Carmen Sheppard, Shamez Ladhani, Matthew D Snape, Jason Hinds, Andrew J Pollard, Persistent Circulation of Vaccine Serotypes and Serotype Replacement After 5 Years of Infant Immunization With 13-Valent Pneumococcal Conjugate Vaccine in the United Kingdom, The Journal of Infectious Diseases, Volume 221, Issue 8, 15 April 2020, Pages 1361–1370.

DOI: https://doi.org/10.1093/infdis/jiz178

Keywords

  • Adults
  • Carriage
  • Children
  • Disease
  • Invasive
  • Pneumococcus
  • Seroprevalence

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