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Infect. Immun., 05 1995, 1658-1662, Vol 63, No. 5
E Fikrig, H Tao, SW Barthold and RA Flavell
A nonclonal population of Borrelia burgdorferi N40 (passage 3) that
survived protective immunity following challenge inoculation of outer
surface protein (Osp) A- or B-hyperimmunized mice were characterized for
the molecular basis of evasion of immunity. Two of six B. burgdorferi
isolates, cultured from OspA-immunized mice, had antigenic diversity in the
carboxyl terminus of OspA and did not bind to the protective OspA
monoclonal antibody designated IXDII. However, OspA- immunized mice
challenged with these variants were fully protected. Moreover, B.
burgdorferi isolates with a point mutation in ospB, which results in a
truncated OspB that does not bind to protective OspB monoclonal antibody
7E6C, were frequently enriched after infection of OspB-immunized mice.
These studies suggest that the incomplete efficacy of an OspA- or
OspB-based vaccine may be partly due to immunomediated in vivo selective
pressure, resulting in the persistence of some spirochetes that do not bind
to protective antibodies.
Copyright © 1995, American Society for Microbiology
Selection of variant Borrelia burgdorferi isolates from mice immunized with outer surface protein A or B
Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut 06520-8031, USA.
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