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Table 3 The most common vacA genotypes involved in progressing to peptic ulcer

From: Association of Helicobacter pylori vacA genotypes and peptic ulcer in Iranian population: a systematic review and meta-analysis

Most common genotypes associated with peptic ulcer disease

Iran

Europe

Southeast Asia

Middle East

s1

+

+

+

+

s2

–

–

–

–

m1

+

+

+

+

m2

–

–

–

–

s1m1

–

–

–

–

s1m2

+

–

–

–

s2m1

–

–

–

–

s2m2

–

–

–

–

i1

–

–

+

–