Allelic diversity of the Helicobacter priori vacuolating cytotoxin gene in South Africa: Rarity of the vacA s1a genotype and natural occurrence of an s2/m1 allele
Journal of Clinical Microbiology, Volume 37, No. 4, Year 1999
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We describe the rarity of Helicobacter pylori strains of vacuolating cytotoxin type s1a (the type most commonly associated with peptic ulceration in the United States) among black and mixed-race South Africans. We also provide the first description of a naturally occurring strain with the vacA allelic structure s2/m1.