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The Vi capsular polysaccharide (ViPS) protects Salmonella enterica subspecies enterica serotype Typhi (S.Typhi) in vivo by multiple mechanisms. Recent microbiological reports from typhoid endemic countries suggest that acapsulate S.Typhi may occur in nature and contribute to clinical typhoid fever that is indistinguishable from disease caused by capsulate strains. The prevalence and genetic basis of ViPS-negative S.Typhi isolates in children from Kathmandu, Nepal, were tested in 68 isolates. Although 5.9% of isolates tested negative for capsular expression by slide agglutination tests, a novel multiplex PCR assay and individual PCR analyses demonstrated the presence of all 14 genes responsible for the synthesis, transportation and regulation of the ViPS. These data suggest that phenotypically acapsulate S.Typhi may not have a genetic basis for the same.

Original publication

DOI

10.1093/tropej/fmt024

Type

Journal article

Journal

J Trop Pediatr

Publication Date

08/2013

Volume

59

Pages

317 - 320

Keywords

Kathmandu, Nepal, Vi, acapsulate, polysaccharide, salmonella, typhi, typhoid, Child, Genes, Bacterial, Genome, Bacterial, Humans, Infant, Mutation, Nepal, Phenotype, Polymerase Chain Reaction, Polysaccharides, Bacterial, Prevalence, Salmonella typhi, Typhoid Fever