Western blot analysis was used to identify antigenic components of Gardnerella vaginalis. Polypeptides bound to nitrocellulose membranes were probed with murine antisera raised to two strains of G. vaginalis, and antibody-antigen complexes were detected with 125I-labelled antimouse immunoglobulin followed by autoradiography. Although there was inter-strain variation in immunogenic polypeptide profiles, all 23 strains of G. vaginalis examined contained a common antigen of molecular mass 41 kDa. This antigen was not found in any of six other bacterial genera.
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