Pneumococcal polysaccharide vaccine at 12 months of age produces functional immune responses


Licciardi, PV; Balloch, A; Russell, FM; Burton, RL; Lin, JS; Nahm, MH; Mulholland, EK; Tang, MLK; (2012) Pneumococcal polysaccharide vaccine at 12 months of age produces functional immune responses. The Journal of allergy and clinical immunology, 129 (3). 794-U283. ISSN 0091-6749 DOI: 10.1016/j.jaci.2011.11.043

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Abstract

Background: Infections with Streptococcus pneumoniae (pneumococcus) are a cause of significant child mortality. Pneumococcal glycoconjugate vaccines are expensive and provide limited serotype coverage. The 23-valent pneumococcal polysaccharide vaccine (Pneumovax) might provide wider serotype coverage but is reported to be weakly immunogenic in children less than 2 years of age. We have previously reported that Pneumovax administered to healthy 12-month-old Fijian infants elicits significant serotype-specific IgG responses. However, the functional capacity of these responses in 12-month-old infants is not known. Objective: We sought to assess the functional, serotype-specific immune response of 12-month-old infants after immunization with Pneumovax. Methods: Functional responses of 12-month-old infants were assessed by using the opsonophagocytic and antibody avidity assay against 8 serotypes and 23 serotypes, respectively. Results: Seventy-one percent of infants produced strong opsonophagocytic activity against 4 of 8 serotypes, and 30% produced high-avidity serotype-specific IgG antibodies to 10 of 23 serotypes at 2 weeks after Pneumovax. Responses were protective for most serotypes that cause disease in Western countries, whereas responses to most of the epidemiologically relevant serotypes for developing countries were low. Conclusion: This is the first comprehensive study evaluating the functional antibody response to Pneumovax in 12-month-old infants. Pneumovax induced functional antibody responses to several serotypes causing disease in Western countries but induced poorer responses to serotypes that are responsible for the majority of disease in developing countries. Pneumovax might be of benefit in some populations, but further studies are required before this can be recommended in developing countries. (J Allergy Clin Immunol 2012;129:794-800.)

Item Type: Article
Keywords: Pneumococcal polysaccharide vaccine, antibody, opsonophagocytosis, avidity, function, serotype, Pneumovax, 23-valent pneumococcal, polysaccharide vaccine (Pneumovax), conjugate-vaccine, streptococcus-pneumoniae, antibody-responses, serotype 6b, immunogenicity, infants, trial, opsonophagocytosis, protection, schedule
Faculty and Department: Faculty of Epidemiology and Population Health > Dept of Infectious Disease Epidemiology
Research Centre: Centre for Maternal, Reproductive and Child Health (MARCH)
PubMed ID: 22305678
Web of Science ID: 301189300027
URI: http://researchonline.lshtm.ac.uk/id/eprint/55084

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