Relationship among Shigella spp. and enteroinvasive Escherichia coli (EIEC) and their differentiation

Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]
Abu Ud-Din, Syeda Wahid

Abstract

Shigellosis produces inflammatory reactions and ulceration on the intestinal epithelium followed by bloody or mucoid diarrhea. It is caused by enteroinvasive E. coli (EIEC) as well as any species of the genus Shigella, namely, S. dysenteriae, S. flexneri, S. boydii, and S. sonnei. This current species designation of Shigella does not specify genetic similarity. Shigella spp. could be easily differentiated from E. coli, but difficulties observed for the EIEC-Shigella differentiation as both show similar biochemical traits and can cause dysentery using the same mode of invasion. Sequencing of multiple housekeeping genes indicates that Shigella has derived on several different occasions via acquisition of the transferable forms of ancestral virulence plasmids within commensal E. coli and form a Shigella-EIEC pathovar. EIEC showed lower expression of virulence genes compared to Shigella, hence EIEC produce less severe disease than Shigella spp. Conventional microbiological techniques often lead to confusing results concerning the discrimination between EIEC and Shigella spp. The lactose permease gene (lacY) is present in all E. coli strains but absent in Shigella spp., whereas β-glucuronidase gene (uidA) is present in both E. coli ...Continue Reading

Citations

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Oct 25, 2016·Frontiers in Cellular and Infection Microbiology·Javier Sanchez-VillamilFernando Navarro-Garcia
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Methods Mentioned

BETA
electrophoresis
ribotyping
PCR-ELISA
ELISA
PCR

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