Abstract:
:The licensed meningococcal serogroup B vaccine, 4CMenB (Bexsero(®)), contains recombinant membrane proteins (rMenB) and outer membrane vesicles (OMV) of the New Zealand serogroup B strain. We investigated whether reducing the OMV and/or protein content influences 4CMenB immunogenicity and reactogenicity in healthy two month-old infants. Six formulations were studied: 4CMenB, rMenB with 0, ¼ or ½ the OMV dose in 4CMenB, a half-dose of 4CMenB or a prelicensure formulation of 4CMenB, as a 4-dose primary/booster series, concomitantly with routine vaccines (DTaP-HBV-IPV/Hib and 7-valent pneumococcal conjugate) at 2, 3, 4 and 12 months of age. Immunogenicity was assessed as serum bactericidal activity measured with human complement (hSBA) against indicator strains for Men B vaccine antigens before and after the 2,3,4-month series and 12-month dose. Parents recorded solicited reactions for 7 days after each vaccination, and any adverse events throughout the study period. All formulations elicited robust immune response against rMenB components at 5 months, there was some evidence of OMV and protein dose-dependence for Men B indicator strains tested. Titers waned up to the 12-month dose, which elicited further strong responses, which were still OMV and protein dose-dependent. Groups with no, or low-dose OMV displayed slightly lower reactogenicity profiles, but all formulations were generally well-tolerated, high fever was rare and transient, and only three transient SAEs were considered possibly vaccine-related. Decreasing or removing the OMV content reduced reactogenicity of 4CMenB to a certain extent, but had an unacceptable negative impact on the immunogenicity profile. Trial: Clinicaltrials.gov NCT00937521.
journal_name
Hum Vaccin Immunotherjournal_title
Human vaccines & immunotherapeuticsauthors
Esposito S,Prymula R,Zuccotti GV,Xie F,Barone M,Dull PM,Toneatto Ddoi
10.4161/hv.29218subject
Has Abstractpub_date
2014-01-01 00:00:00pages
2005-14issue
7eissn
2164-5515issn
2164-554Xjournal_volume
10pub_type
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