Quality of antibody responses by adults and young children to 13-valent pneumococcal conjugate vaccination and Streptococcus pneumoniae colonisation.

Wolf, Asia-Sophia, Mitsi, Elena, Jones, Scott, Jochems, Simon ORCID: https://orcid.org/0000-0002-4835-1032, Roalfe, Lucy, Thindwa, Deus, Meiring, James E, Msefula, Jacquline, Bonomali, Farouck, Makhaza Jere, Tikhala, Mbewe, Maurice, Collins, Andrea ORCID: https://orcid.org/0000-0002-4094-1572, Gordon, Stephen ORCID: https://orcid.org/0000-0001-6576-1116, Gordon, Melita A, Ferreira, Daniela ORCID: https://orcid.org/0000-0002-0594-0902, French, Neil, Goldblatt, David, Heyderman, Robert S and Swarthout, Todd D (2022) 'Quality of antibody responses by adults and young children to 13-valent pneumococcal conjugate vaccination and Streptococcus pneumoniae colonisation.'. Vaccine, Vol 40, Issue 50, p. 7210.

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Abstract

Childhood pneumococcal conjugate vaccine (PCV) protects against invasive pneumococcal disease caused by vaccine-serotype (VT) Streptococcus pneumoniae by generating opsonophagocytic anti-capsular antibodies, but how vaccination protects against and reduces VT carriage is less well understood. Using serological samples from PCV-vaccinated Malawian individuals and a UK human challenge model, we explored whether antibody quality (IgG subclass, opsonophagocytic killing, and avidity) is associated with protection from carriage. Following experimental challenge of adults with S. pneumoniae serotype 6B, 3/21 PCV13-vaccinees were colonised with pneumococcus compared to 12/24 hepatitis A-vaccinated controls; PCV13-vaccination induced serotype-specific IgG, IgG1, and IgG2, and strong opsonophagocytic responses. However, there was no clear relationship between antibody quality and protection from carriage or carriage intensity after vaccination. Similarly, among PCV13-vaccinated Malawian infants there was no relationship between serotype-specific antibody titre or quality and carriage through exposure to circulating serotypes. Although opsonophagocytic responses were low in infants, antibody titre and avidity to circulating serotypes 19F and 6A were maintained or increased with age. These data suggest a complex relationship between antibody-mediated immunity and pneumococcal carriage, and that PCV13-driven antibody quality may mature with age and exposure.

Item Type:	Article
Subjects:	QW Microbiology and Immunology > Antigens and Antibodies. Toxins and Antitoxins > QW 575 Antibodies QW Microbiology and Immunology > Immunotherapy and Hypersensitivity > QW 806 Vaccination WA Public Health > Preventive Medicine > WA 115 Immunization WC Communicable Diseases > Infection. Bacterial Infections > Bacterial Infections > WC 210 Streptococcal infections (General or not elsewhere classified) WC Communicable Diseases > Infection. Bacterial Infections > Bacterial Infections > WC 217 Pneumococcal infections
Faculty: Department:	Clinical Sciences & International Health > Clinical Sciences Department
Digital Object Identifer (DOI):	https://doi.org/10.1016/j.vaccine.2022.09.069
SWORD Depositor:	JISC Pubrouter
Depositing User:	JISC Pubrouter
Date Deposited:	22 Nov 2022 11:29
Last Modified:	22 Nov 2022 11:29
URI:	https://archive.lstmed.ac.uk/id/eprint/21357

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