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  • Title: Allelic diversity of the Helicobacter pylori vacuolating cytotoxin gene in South Africa: rarity of the vacA s1a genotype and natural occurrence of an s2/m1 allele.
    Author: Letley DP, Lastovica A, Louw JA, Hawkey CJ, Atherton JC.
    Journal: J Clin Microbiol; 1999 Apr; 37(4):1203-5. PubMed ID: 10074554.
    Abstract:
    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.
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