Figure 3From: PCR-based genotyping of Helicobacter pylori of Gambian children and adults directly from biopsy specimens and bacterial culturesPCR inferred results of signal region of vacA gene. 1.5% gel electrophoresis of H. pylori genotypes showing PCR results of s1 and s2 allelles of vacA gene. Lane M is a 100 bp ladder (Biolabs, UK), lane 1 and 2 showed the presence of s1 (259 bp), lane 3 is both s1 and s2 positive and lane 4 and 5 are s2 (289 bp) positive.Back to article page