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The cagA gene, alleles of the vacA gene, random amplified polymorphic DNA (RAPD), and neutrophil activating capacity (HpNAC) were used to examine paired H. pylori isolates from 10 noneradicated individuals 9 years apart. Paired isolates from each patient were indistinguishable with regard to vacA alleles, RAPD, and HpNAC. Isolates from nine patients showed concordance for the cagA gene, which was...
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