Abstract
A total of 28 strains of Campylobacter comprising representatives of C. sputorum subsp. sputorum, C. sputorum subsp. bubulus, C. sputorum subsp. mucosalis, C. concisus, “C. fecalis”, “C. hyointestinalis” and the CNW Campylobacter group have been characterized by SDS-PAGE of cellular proteins. The protein patterns, which contained 40 to 50 discrete bands, were highly reproducible and were used as the basis of a numerical taxonomic analysis. Eight clusters were obtained at the 55% similarity level and each corresponded to a recognized species or group. The analysis demonstrated unequivocally that C. sputorum subsp. mucosalis constituted a distinct species although the serogroup A strains differed slightly from the serogroup B and C strains. Also, it was shown that C. sputorum subsp. bubulus and “C. fecalis” were closely related and should be classified in the same species. As that taxon contained catalase-positive and catalase-negative strains, over-reliance on that test could lead to incorrect identification. Each of the species clusters had distinctive protein band patterns and the main bands provide useful diagnostic markers for the rapid identification of human and animal isolates.
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