Inferior quantitative and qualitative immune responses to pneumococcal conjugate vaccine in infants with nasopharyngeal colonization by Streptococcus pneumoniae during the primary series of immunization
Date
2011
Authors
Madhi S.A.
Violari A.
Klugman K.P.
Lin G.
McIntyre J.A.
von Gottberg A.
Jean-Philippe P.
Cotton M.F.
Adrian P.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Background: Heightened immunogenicity, measured one month after the primary series of pneumococcal conjugate vaccine (PCV), in African children was previously hypothesized to be due to increased rates of nasopharyngeal pneumococcal colonization during early infancy. Methods: We analyzed the effect of selected vaccine-serotype (6B, 19F and 23F) nasopharyngeal colonization prior to the first PCV dose or when colonized for the first time prior to the second or third (2nd/3rd) PCV dose on serotype quantitative and qualitative antibody responses. Results: Colonization prior to receiving the first PCV was associated with lower geometric mean antibody concentrations (GMCs) one month after the third dose of PCV and six months later to the colonizing-serotype. Colonized infants also had lower geometric mean titers (GMTs) on opsonophagocytosis activity assay (OPA) and a lower proportion had titers ≥8 against the colonizing serotypes (19F and 23F) post vaccination. Colonization occurring only prior to the 2nd/3rdPCV dose was also associated with lower GMCs and OPA GMTs to the colonizing-serotype. The effect of colonization with serotypes 19F and 23F prior to PCV vaccination had a greater effect on a lower proportion of colonized infants having OPA titers ≥8 than the effect of colonization on the lower proportion with antibody ≥0.35 μg/ml. Conclusion: Infant nasopharyngeal colonization at any stage before completing the primary series of PCV vaccination was associated with inferior quantitative and qualitative antibody responses to the colonizing-serotype. © 2011 Elsevier Ltd.
Description
Keywords
Colonization, HIV, Hypo-responsiveness, Immunogenicity, Pneumococcal conjugate vaccine, Streptococcus pneumoniae, pneumococcal conjugate vaccine, Pneumococcus vaccine, unclassified drug, antibody blood level, antibody response, antibody titer, article, bacterial colonization, child, comparative study, female, geometric mean antibody concentration, geometric mean titer, human, immune response, immunization, infant, major clinical study, male, nasopharyngeal colonization, opsonophagocytosis activity assay, phagocytosis, priority journal, qualitative antibody response, quantitative antibody response, serotype, Streptococcus pneumoniae
Citation
Vaccine
29
40
http://www.scopus.com/inward/record.url?eid=2-s2.0-80052340389&partnerID=40&md5=1486c5c547f568a49c8e295a99131b70
29
40
http://www.scopus.com/inward/record.url?eid=2-s2.0-80052340389&partnerID=40&md5=1486c5c547f568a49c8e295a99131b70