TABLE 2.
Distribution of vacA alleles in 37 H. pylori isolates from 26 patientsa
| Midregion type | No. of isolates (patients) with signal sequence type:
|
Total | ||
|---|---|---|---|---|
| s1a | s1b | s2 | ||
| m1 | 17 (12) | 2 (1) | 0 | 19 (13) |
| m2 | 9 (6) | 3 (2) | 6 (5) | 18 (13) |
| Total | 26 (18) | 5 (3) | 6 (5) | 37 (26) |
a
Five of six possible combinations of vacA signal sequence and midregion types could be identified; the s2-m1 combination was not detected. Of note, the vacA midregion alleles and signal sequence types of three H. pylori isolates obtained from individual patients could not be determined (data not shown in table).