Memory B cell responses induced by pneumococcal conjugate vaccine schedules with fewer doses: analysis of a randomised-controlled trial in Viet Nam

• Published in: Nature communications Vol. 15; no. 1; pp. 6968 - 10
• Main Authors: Ong, Darren Suryawijaya, Phan, Thanh V., Temple, Beth, Toh, Zheng Quan, Nguyen, Cattram Duong, Vientrung, Kien, Nguyen, Hoang Van Anh, Thi Trang Dai, Vo, Bright, Kathryn, Tran, Hau Phuc, Higgins, Rachel Ann, Cheung, Yin Bun, Vu Nguyen, Thuong, Mulholland, Kim, Licciardi, Paul Vincent
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 14.08.2024; Nature Publishing Group; Nature Portfolio
• Subjects: 13; 13/1; 631/250/590/1962; 692/308/2779/777; 692/308/3187; 692/699/255/1318; Access control; Age; Antibodies, Bacterial - blood; Antibodies, Bacterial - immunology; Child, Preschool; Conjugates; Cost analysis; Decision making; Disease control; Female; Humanities and Social Sciences; Humans; Immunization; Immunization Schedule; Immunogenicity; Immunoglobulin G; Immunoglobulin G - blood; Immunoglobulin G - immunology; Immunological memory; Infant; Lymphocytes B; Male; Memory B Cells - immunology; Memory cells; multidisciplinary; Pneumococcal Infections - immunology; Pneumococcal Infections - prevention & control; Pneumococcal Vaccines - administration & dosage; Pneumococcal Vaccines - immunology; Schedules; Science; Science (multidisciplinary); Serogroup; Serotypes; Streptococcus pneumoniae - immunology; Vaccination - methods; Vaccines; Vaccines, Conjugate - administration & dosage; Vaccines, Conjugate - immunology; Vietnam; Vietnam
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-024-51413-7

The use of pneumococcal conjugate vaccine (PCV) schedules with fewer doses are being considered to reduce costs and improve access, particularly in low- and middle-income countries. While several studies have assessed their immunogenicity, there are limited data on their potential for long-term immune protection, as assessed by pneumococcal serotype-specific memory B cell (B mem ) responses. This current study reports secondary outcome data that aims to compare B mem responses following reduced-dose (0 + 1 and 1 + 1) schedules of PCV10 and PCV13 in Vietnamese infants from our randomised-controlled trial (trial registration number NCT03098628). Following vaccination at 12 months of age, B mem levels for most serotypes peaked seven days post-vaccination and were higher in magnitude for the 1 + 1 than 0 + 1 schedules and for PCV13 than PCV10. Furthermore, B mem did not wane as rapidly as IgG levels by 24 months of age. Further studies are needed to assess the use of B mem as markers of long-term protection against pneumococcal carriage and disease, which is crucial to generate data for immunisation program decision-making. As part of a randomized controlled trial in Viet Nam, this study finds that pneumococcal-specific memory B cells (B mem ) are higher following a 1 + 1 compared to a 0 + 1 pneumococcal conjugate vaccine (PCV) schedule and higher for PCV13 compared to PCV10. B mem did not wane as rapidly as IgG by 24 months of age.