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Infect. Immun., 12 1995, 4642-4652, Vol 63, No. 12
E Rosenqvist, EA Hoiby, E Wedege, K Bryn, J Kolberg, A Klem, E Ronnild, G Bjune and H Nokleby
The antibody kinetics in sera from 27 adults after three doses of the
Norwegian group B meningococcal outer membrane vesicle (OMV) vaccine was
studied. The vaccinees received the third dose 4 to 5 years after the first
two. Antibody responses against outer membrane proteins (OMPs) and
lipopolysaccharides were studied by enzyme-linked immunosorbent assay and
immunoblotting and with serum bactericidal assays (SBA) with three variants
of the vaccine strain, 44/76. Six weeks after the second injection, the
geometric mean (GM) of the levels of immunoglobulin G (IgG) against OMVs
was about sevenfold higher than that of prevaccination levels, and 74% of
the vaccinees developed a greater-than-twofold rise in SBA titer. After 6
months, the GM of IgG levels declined to about threefold higher, and after
4 to 5 years it declined to about twofold higher, than that before
vaccination. The third dose induced a rapid increase in SBA titers in 96%
of the vaccinees, and the GM of levels of IgG against OMVs rose to about
14- fold the prevaccination level. One year later, the IgG antibody levels
had dropped to 4.6-fold the prevaccination level, but 88% of the vaccinees
still showed bactericidal activity. The response after the two first doses
was higher in individuals with prevaccination antibodies, but no such
effect was found after three doses. The use of defined mutants in SBA and
linear multiple regression analyses indicated that among the major OMPs,
antibodies to the Opc and class 1 proteins made the most important single
contributions to the bactericidal activity against the vaccine strain, but
it also demonstrated the importance of antibodies against other antigens.
After three doses, 68% of the vaccinees showed a significant SBA response
against a strain lacking both the Opc and the class 1 proteins. Three doses
converted almost all subjects to SBA responders and gave higher antibody
levels and relatively less serosubtype-specific bactericidal activity than
did two doses, probably indicating a broader cross- protection against
heterologous strains.
Copyright © 1995, American Society for Microbiology
Human antibody responses to meningococcal outer membrane antigens after three doses of the Norwegian group B meningococcal vaccine
Department of Vaccinology, National Institute of Public Health, Oslo, Norway.
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