The vacA s and m genotypes and the presence of cagA and IS605 were determined in Helicobacter pylori strains from patients with mono- and multiple infections. Surprisingly, these genetic markers were not associated with nonulcer dyspepsia or mucosa-associated lymphoid tissue lymphoma. The presence of cagA correlated with the presence of the vacA s1 allele (P < 0.05), whereas the presence of IS605 was associated with the presence of the s2 allele (P < 0.05).

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC85157PMC
http://dx.doi.org/10.1128/JCM.37.7.2348-2349.1999DOI Listing

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