10-valent pneumococcal non-typeable Haemophilus influenzae protein-D conjugate vaccine (PHiD-CV) induces memory B cell responses in healthy Kenyan toddlers

D. M. Muema, E. W. Nduati, M. Uyoga, M. Bashraheil, J. A.G. Scott, L. L. Hammitt, B. C. Urban

Research output: Contribution to journalArticle

Abstract

Memory B cells are long-lived and could contribute to persistence of humoral immunity by maintaining the plasma-cell pool or making recall responses upon re-exposure to an antigen. We determined the ability of a pneumococcal conjugate vaccine to induce anti-pneumococcal memory B cells. Frequencies of memory B cells against pneumococcal capsular polysaccharides from serotypes 1, 6B, 14, 19F and 23F were determined by cultured B cell enzyme-linked immunospot (ELISPOT) in 35 children aged 12-23 months who received pneumococcal non-typeable Haemophilus influenzae protein-D conjugate vaccine (PHiD-CV). The relationships between plasma antibodies and memory B cell frequencies were also assessed. After two doses of PHiD-CV, the proportion of subjects with detectable memory B cells against pneumococcal capsular polysaccharides increased significantly for serotypes 1 (3-45%; P<0·01), 19F (21-66%; P<0·01) and 23F (13-36%; P=0·02), but not serotypes 6B (24-42%; P=0·24) and 14 (21-40%; P=0·06). Correlations between antibodies and memory B cells were weak. Carriage of serotype 19F at enrolment was associated with poor memory B cell responses against this serotype at subsequent time-points (day 30: non-carriers, 82% versus carriers, 0%, P<0·01; day 210: non-carriers, 72% versus carriers, 33%, P=0·07). PHiD-CV is capable of inducing memory B cells against some of the component pneumococcal capsular polysaccharides.

Original languageEnglish (US)
Pages (from-to)297-305
Number of pages9
JournalClinical and Experimental Immunology
Volume181
Issue number2
DOIs
StatePublished - Jan 1 2015

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Keywords

  • Children
  • ELISPOT
  • Memory B cells
  • PHiD-CV
  • Pneumococcal conjugate vaccines

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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