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The genetic diversity of 33 Nigerian Helicobacter pylori isolates were studied using RAPD, PCR-RFLP and Southern blot analysis of ureA or ureCD gene probes. RAPD was able to distinguish the following number of isolates using the primers 3880 : 5ʹ-AAGAGCCCGT-3ʹ (28), 3881 :5ʹ-AACGCGCAAC-3ʹ (33) and OPH8 :5ʹ-GAAACACCCC-3ʹ (25). Southern blot analysis using the ureCD probe was also able to distinguish the 12 isolates tested into ten different patterns. The PCR-RFLP technique distinguished all 33 isolates into six types. In conclusion, considering typeability, discriminatory power, and convenience, RAPD with the 3881 primer was considered the most useful technique.

Discriminatory Power of RAPD,PCR-RFLP and Southern Blot Analyses of ureCD or ureA Gene Probes on Helicobacter pylori Isolates