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To determine whether lipopolysaccharide (LPS) structures of Campylobacter species are immunologically related to those of 11 other gram-negative organisms, we immunoblotted from polyacrylamide gels the LPS of these strains with immune rabbit serum raised against six Campylobacter jejuni strains and two Campylobacter fetus strains. The LPS studied were from Salmonella minnesota wild type and Ra to Re mutants, Salmonella typhi, Escherichia coli, Yersinia enterocolitica, Vibrio cholerae, and Pseudomonas aeruginosa. None of the 11 LPS preparations was recognized by the eight antisera, but antisera to each of the Campylobacter strains recognized core determinants of some LPS preparations. Antiserum directed against the most serum-sensitive C. jejuni strain, 79-193, was the only antiserum sample that recognized core regions of the rough Salmonella mutants. In converse experiments, when LPS preparations from five Campylobacter strains were blotted with antiserum to Salmonella lipid A, recognition of core structures of each was shown; data from an enzyme-linked immunosorbent assay confirmed this result. In contrast, antiserum to Salmonella typhimurium Re LPS showed no reactivity. We conclude that LPS of Campylobacter strains share lipid A antigenic determinants with the core region of LPS of several other gram-negative organisms.

Lipopolysaccharide structures in Enterobacteriaceae, Pseudomonas aeruginosa, and Vibrio cholerae are immunologically related to Campylobacter spp