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© Institut Pasteur/Antoinette Ryter
Salmonella spp. Bactéries à Gram négatif, aérobies ou anaérobies facultatifs à transmission orofécale. Les salmonelles majeures (sérotype typhi et sérotype paratyphi) sont responsables des fièvres typhoïde et paratyphoïde chez l'homme uniquement ; les salmonelles mineures (sérotype typhimurium et sérotype enteritidis) sont impliquées dans 30 à 60 % des gastroentérites et toxiinfections d'origine alimentaire. Image colorisée.
Publication : eLife

Species-wide whole genome sequencing reveals historical global spread and recent local persistence in Shigella flexneri

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in eLife - 04 Aug 2015

Connor TR, Barker CR, Baker KS, Weill FX, Talukder KA, Smith AM, Baker S, Gouali M, Pham Thanh D, Jahan Azmi I, Dias da Silveira W, Semmler T, Wieler LH, Jenkins C, Cravioto A, Faruque SM, Parkhill J, Wook Kim D, Keddy KH, Thomson NR

Link to Pubmed [PMID] – 26238191

Elife 2015;4:e07335

Shigella flexneri is the most common cause of bacterial dysentery in low-income countries. Despite this, S. flexneri remains largely unexplored from a genomic standpoint and is still described using a vocabulary based on serotyping reactions developed over half-a-century ago. Here we combine whole genome sequencing with geographical and temporal data to examine the natural history of the species. Our analysis subdivides S. flexneri into seven phylogenetic groups (PGs); each containing two-or-more serotypes and characterised by distinct virulence gene complement and geographic range. Within the S. flexneri PGs we identify geographically restricted sub-lineages that appear to have persistently colonised regions for many decades to over 100 years. Although we found abundant evidence of antimicrobial resistance (AMR) determinant acquisition, our dataset shows no evidence of subsequent intercontinental spread of antimicrobial resistant strains. The pattern of colonisation and AMR gene acquisition suggest that S. flexneri has a distinct life-cycle involving local persistence.

http://www.ncbi.nlm.nih.gov/pubmed/26238191