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Distribution of signal sequence and midregion alleles by age group for strains from 55 children infected with H. pylori strains with nonmixed vacA allelic types
| Age (yr) | No. of strains from children:
|
||||||||
|---|---|---|---|---|---|---|---|---|---|
| With ulcer (n = 19)
|
Without ulcer (n = 36)
|
||||||||
| s1 | s2 | m1 | m2 | s1 | s2 | m1 | m2 | m1,2a | |
| 1–8 | 1 | 0 | 1 | 0 | 3 | 9 | 2 | 10 | 0 |
| 9–17 | 18 | 0 | 15 | 3 | 18 | 6 | 16 | 7 | 1 |
| Total | 19 | 0 | 16 | 3 | 21 | 15 | 18 | 17 | 1 |
