Proteinase K-digested cell lysates from 25 Campylobacter fetus subspecies fetus and C. fetus subsp. venerealis strains were examined by SDS-PAGE and immunoblotting. Three SDS-PAGE lipopolysaccharide (LPS) profiles were observed. Two profiles were consistent with those previously reported for serogroup A and serogroup B and AB isolates and were distinguished by the relative mobility of bands in the O-chain region and by a strong reaction on immunoblots with homologous antisera. The third profile was similar but had faster migrating O-chain bands. Immunoblot reactions using homologous and heterologous adsorbed antisera showed that the O-antigen of the C. fetus subsp. fetus reference strain and other profile 2-type LPS strains was distinct from the O-antigens of strains with profile 1- or profile 3-type LPS. O-antigens of strains with profile 1- and profile 3-type LPS had shared epitopes. One strain had core components but no detectable O-antigens. Common core LPS antigens appear to be present in all strains and antibodies to common core LPS epitopes may be useful reagents for rapid detection of C. fetus.
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