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Relationship between vacA typing and grade of vacu-olating cytotoxin activity
| vacA type |
Grade of vacuolating cytotoxin activity |
||
| None | Low | High | |
| s1a | 5 | 38 | 68 |
| s1b | 17 | 24 | 22 |
| s2 | 18 | 0 | 0 |
| m1 | 10 | 30 | 59 |
| m2 | 30 | 32 | 31 |
P < 0.05, each group vs s1a, s1b, s2.
