Abstract
Comparison of partial 16S rRNA sequences from representative Campylobacter species indicates that the Campylobacter species form a previously undescribed basic eubacterial group, which is related to the other major groups only by very deep branching. This analysis was extended to include the spiral bacterium associated with human gastritis, Campylobacter pylori (formerly Campylobacter pyloridis). The distance between C. pylori and the other Campylobacter species is sufficient to exclude the pyloric organism from the Campylobacter genus. The results indicate that C. pylori is more closely related to Wolinella succinogenes than it is to the other Campylobacter species inspected. Another close relative of the campylobacters was found to be Thiovulum, a sulfide-dependent marine bacterium.
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