Abstract:
:In anticipation of future combination vaccines, a recombinant class 3 porin (rPorB) of group B meningococci was evaluated as an alternative carrier protein for a Haemophilus influenzae type b (Hib) polyribosylribotol phosphate (PRP) conjugate vaccine. The use of rPorB may avoid undesirable immunologic interactions among vaccine components, including epitopic suppression from conventional carriers (e.g. tetanus toxoid [TT]), as well as provide desirable immunomodulatory effects. Rats were found to be more reliable and consistent than mice or guinea pigs for studying antibody responses to the Hib conjugates. Different Hib conjugates, Hib-TT and Hib-rPorB, consisting of PRP conjugated by reductive amination to TT or rPorB, were compared in rats. Commercially available, licensed vaccines, HbOC (HibTITER) and PRP-T (OmniHib), were used as reference controls. Maximum geometric mean ELISA IgG titers were obtained in rats after only two doses, showing booster effects for all. However, Hib-rPorB immunization consistently resulted in responses that were 1-2 orders of magnitude greater than those for the other conjugates, including the licensed control vaccines. A maximum 4600-fold rise was observed for Hib-rPorB after two doses, and, unlike the other conjugates, a 100% response rate was always achieved without adjuvant. These results warrant further investigation of Hib-rPorB in combination with DTaP.
journal_name
Vaccinejournal_title
Vaccineauthors
Fusco PC,Michon F,Laude-Sharp M,Minetti CA,Huang CH,Heron I,Blake MSdoi
10.1016/s0264-410x(98)00174-1subject
Has Abstractpub_date
1998-11-01 00:00:00pages
1842-9issue
19eissn
0264-410Xissn
1873-2518pii
S0264410X98001741journal_volume
16pub_type
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