Genetic tree based on an informative 620 bp segment of vacA gene containing vacAm2 alleles of H. pylori strains determined in this study (strains 1-5) or reported by others. The test strains determined in this study are marked in black bold face. Sequences other than those for the test strains are from public database, as indicated. The tree was generated using DDBJ programme. Each number in this figure indicates the vacAm2 sequence from a given strain, as follows (GenBank accession numbers in parentheses). The strains used are as follows 1.7 [GU441846] 2.16 [GU441848] 3.25 [GU441849] 4.202 [GU441844] 5.220 [GU441850] 6. JapanOK160 [AB190979] 7. JapanOK204 [AB190986] 8. JapanOK205 [AB190987)] 9. JapanOK210 [AB190988] 10. JapanOK129 [AB190972] 11. JapanOK181 [AB190982] 12. GermanyMz28a [AJ006969] 13. GermanyMz26a [AJ006968] 14. India90 [AF220119].