Fig. 2From: Geographic distribution of the cagA, vacA, iceA, oipA and dupA genes of Helicobacter pylori strains isolated in ChinaDistribution of vacA s, m and i region genotypes of H. pylori strains from different regions of China. The prevalence of each type (s1a, s1c, s2, m1, m2, i1 and i2) is given as a percentage of the total number of strains (shown in parentheses)Back to article page