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Concomitant administration of Mycobacterium bovis BCG with the meningococcal C conjugate vaccine to neonatal mice enhances antibody response and protective efficacy.

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Authors
Brynjolfsson, Siggeir F
Bjarnarson, Stefania P
Mori, Elena
Del Giudice, Giuseppe
Jonsdottir, Ingileif
Issue Date
2011-11

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Clin. Vaccine Immunol. 2011, 18 (11):1936-42
Abstract
Mycobacterium bovis BCG is administered to human neonates in many countries worldwide. The objective of the study was to assess if BCG could act as an adjuvant for polysaccharide-protein conjugate vaccines in newborns and thereby induce protective immunity against encapsulated bacteria in early infancy when susceptibility is high. We assessed whether BCG could enhance immune responses to a meningococcal C (MenC) conjugate vaccine, MenC-CRM(197), in mice primed as neonates, broaden the antibody response from a dominant IgG1 toward a mixed IgG1 and IgG2a/IgG2b response, and increase protective efficacy, as measured by serum bactericidal activity (SBA). Two-week-old mice were primed subcutaneously (s.c.) with MenC-CRM(197). BCG was administered concomitantly, a day or a week before MenC-CRM(197). An adjuvant effect of BCG was observed only when it was given concomitantly with MenC-CRM(197), with increased IgG response (P = 0.002) and SBA (8-fold) after a second immunization with MenC-CRM(197) without BCG, indicating increased T-cell help. In neonatal mice (1 week old) primed s.c. with MenC-CRM(197) together with BCG, MenC-polysaccharide (PS)-specific IgG was enhanced compared to MenC-CRM(197) alone (P = 0.0015). Sixteen days after the second immunization with MenC-CRM(197), increased IgG (P < 0.05), IgG1 (P < 0.05), IgG2a (P = 0.06), and IgG2b (P < 0.05) were observed, and only mice primed with MenC-CRM(197) plus BCG showed affinity maturation and detectable SBA (SBA > 128). Thus, vaccination with a meningococcal conjugate vaccine (and possibly with other conjugates) may benefit from concomitant administration of BCG in the neonatal period to accelerate and enhance production of protective antibodies, compared to the current infant administration of conjugate which follows BCG vaccination at birth.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3209029/?tool=pubmed
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Archived with thanks to Clinical and vaccine immunology : CVI
ae974a485f413a2113503eed53cd6c53
10.1128/CVI.05247-11
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English Journal Articles (Peer Reviewed)

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