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Table 1 Genotypes of cagA pre-EPIYA,cagA repeat, cag right-end junction and vacA of Vietnamese H. pylori strains.

From: Analysis of virulence factors of Helicobacter pylori isolated from a Vietnamese population

   Total
(n = 103)
Ho Chi Minh
(n = 49)
Hanoi
(n = 54)
cagA pre-EPIYA Vietnamese pre-EPIYA type 80 (77%) 39 (80%) 41 (76%)
  East Asian pre-EPIYA type 13 (13%) 4 (8%) 9 (17%)
  Western pre-EPIYA type 5 (5%) 3 (6%) 2 (4%)
cagA repeat East Asian type (ABD type) 94 (93%) 43 (88%) 51 (94%)
  Western type (ABC type) 4 (4%) 3 (6%) 1 (2%)
cagA (-)   5 (5%) 3 (6%) 2 (4%)
cag right-end I 9 (9%) 8 (16%) 1 (2%)
  II 87 (84%) 37 (76%) 50 (93%)
  III 4 (4%) 2 (4%) 2 (4%)
  N.D. 3 (3%) 2 (4%) 1 (2%)
vacA s* s1 103 (100%) 49 (100%) 54 (100%)
  s2 1 (1%) 0 (0%) 1 (2%)
vacA m† m1 44 (43%) 15 (31%) 29 (54%)
  m2 54 (52%) 32 (65%) 22 (41%)
  N.D. 5 (5%) 2 (4%) 3 (6%)
  1. N.D.: could not be determined.
  2. * Both s1 and s2 were detected in one case.
  3. † The prevalence of vacA m1 is significantly higher in Hanoi than in Ho Chi Minh, p < 0.05