Table 2.

Distribution of vacA alleles in 37 H. pylori isolates from 26 patientsa

Midregion typeNo. of isolates (patients) with signal sequence type:Total
s1as1bs2
m117 (12)2 (1)019 (13)
m29 (6)3 (2)6 (5)18 (13)
 Total26 (18)5 (3)6 (5)37 (26)
  • a Five of six possible combinations ofvacA signal sequence and midregion types could be identified; the s2-m1 combination was not detected. Of note, thevacA midregion alleles and signal sequence types of threeH. pylori isolates obtained from individual patients could not be determined (data not shown in table).