Impact of meningococcal ACWY conjugate vaccines on pharyngeal carriage in adolescents: evidence for herd protection from the UK MenACWY programme

UKMenCar4 and ‘Be on the TEAM’ Study Collaborators

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36 Citations (Scopus)

Abstract

Objective: Serogroup W and Y invasive meningococcal disease increased globally from 2000 onwards. Responding to a rapid increase in serogroup W clonal complex 11 (W:cc11) invasive meningococcal disease, the UK replaced an adolescent booster dose of meningococcal C conjugate vaccine with quadrivalent MenACWY conjugate vaccine in 2015. By 2018, the vaccine coverage in the eligible school cohorts aged 14 to 19 years was 84%. We assessed the impact of the MenACWY vaccination programme on meningococcal carriage. Methods: An observational study of culture-defined oropharyngeal meningococcal carriage prevalence before and after the start of the MenACWY vaccination programme in UK school students, aged 15 to 19 years, using two cross-sectional studies: 2014 to 2015 “UKMenCar4” and 2018 “Be on the TEAM” (ISRCTN75858406). Results: A total of 10 625 participants preimplementation and 13 438 postimplementation were included. Carriage of genogroups C, W, and Y (combined) decreased from 2.03 to 0.71% (OR 0.34 [95% CI 0.27–0.44], p < 0.001). Carriage of genogroup B meningococci did not change (1.26% vs 1.23% [95% CI 0.77–1.22], p = 0.80) and genogroup C remained rare (n = 7/10 625 vs 17/13 438, p = 0.135). The proportion of serogroup positive isolates (i.e. those expressing capsule) decreased for genogroup W by 53.8% (95% CI -5.0 – 79.8, p = 0.016) and for genogroup Y by 30.1% (95% CI 8.946·3, p = 0.0025). Discussion: The UK MenACWY vaccination programme reduced carriage acquisition of genogroup and serogroup Y and W meningococci and sustained low levels of genogroup C carriage. These data support the use of quadrivalent MenACWY conjugate vaccine for indirect (herd) protection.

Original languageEnglish
Pages (from-to)1649.e1-1649.e8
JournalClinical Microbiology and Infection
Volume28
Issue number12
DOIs
Publication statusPublished - Dec 2022

Bibliographical note

Funding Information:
The authors would like to thank the NIHR Oxford Biomedical Research Centre, Children's Research team, Nottingham University Hospitals NHS Trust; Women's & Children's Research team, University Hospitals Bristol and Weston NHS Foundation Trust; the ‘Be on the TEAM’ Scientific Advisory Board; Chair, Prof Sir Brian Greenwood; Deputy Chair James Stuart, Simon Nadel, Helen Marshall, Helen Bedford, Nick Andrews; James Adamson, Public Health Wales; Andrew Walker & Lloyd Walsh, UKHSA Meningococcal Reference Unit; Melanie Carr; Yama Farooq, Simon Kerridge, Annabel Giddings, and Hannah Robinson, Oxford Vaccine Group; Helen Watson, Heather Murdoch, Laura Walsh, and Laura Macdonald, Public Health Scotland; Karen Duffy, NHS Greater Glasgow and Clyde Clinical Research Unit; NHS Greater Glasgow and Clyde Public Health Department; Thomas Bower, Stephen Saich, Alasdair Munro, Robert Dorey, Louise Haskell, Jane Martin, Helen Gale, Anne Magee, and Anna Hardy, NIHR Southampton Clinical Research Facility; Margaret Varga, University of Oxford; Clarendon Scholarship Fund, University of Oxford (JPC). We thank the study team from all sites for recruitment, data, and sampling; the UKHSA Meningococcal Reference Unit (Manchester UK) and the Maiden Lab (University of Oxford UK) for microbiological and genomics expertise. We acknowledge the Meningitis Research Foundation and Meningitis Now for their input into the Be on the TEAM study. We thank the schools, staff, and participating students for their enthusiasm and support of this research.

Funding Information:
This study was funded by the Wellcome Trust (087622 and 218205/Z/19/Z) and the National Institute for Health Research (NIHR) Policy Research Programme (PR-ST-0915-10015 and PR-R18-0117-21001). The views expressed are those of the authors and not necessarily those of the NIHR or the Department of Health and Social Care. MenB-fHbp for the ‘Be on the TEAM’ study donated by Pfizer. The study funders had no role in the study design or in the collection, analysis or interpretation of data, manuscript preparation, or the decision to submit for publication.

Publisher Copyright:
© 2022 The Author(s)

Keywords

  • ACWY
  • Adolescents
  • Conjugate vaccines
  • Herd immunity
  • Meningococcal Disease
  • Neisseria meningitidis
  • Pharyngeal carriage

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