GC content of DNA of Campylobacter pylori and other species belonging or related to the genus Campylobacter.

DNA of type strain Campylobacter pylori NCTC 11637 and 32 other strains of C. pylori recovered from gastric biopsy specimens was examined by thermal denaturation for its guanine-plus-cytosine (GC) content. The GC content of strain NCTC 11637 was 35.6 mol % (standard deviation (SD) 0.3), and the GC content of the 32 other C. pylori strains ranged from 34.1 to 37.5 mol % (average value 35.2, SD 1.0). A total of 14 type strains of other Campylobacter and Wolinella species were included in this study and the results obtained were compared with those cited in the literature.