Foodborne outbreak and nonmotile Salmonella enterica variant, France - PubMed (original) (raw)

Foodborne outbreak and nonmotile Salmonella enterica variant, France

Simon Le Hello et al. Emerg Infect Dis. 2012 Jan.

Abstract

We report a food-related outbreak of salmonellosis in humans caused by a nonmotile variant of Salmonella enterica serotype Typhimurium in France in 2009. This nonmotile variant had been circulating in laying hens but was not considered as Typhimurium and consequently escaped European poultry flock regulations.

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Figures

Figure A1

Figure A1

Phylogenetic analysis of _Xba_I–pulsed-field gel electrophoresis (PFGE) profiles obtained among a subset of 40 selected nonmotile Salmonella enterica serotype

1

,4,[5],12:–:– strains isolated from humans and nonhumans during 2001–2009, France. Multilocus variable number tandem repeat analysis (MLVA), strain code, antimicrobial susceptibility testing (AST), PFGE profile found in our PFGE Typhimurium database, antigenic formula (serotype), and source and year of isolation are indicated to the right of the PFGE profiles. The MLVA groups indicated in the rectangles are the strains with the MLVA type found in our food poisoning investigation with its single- and double-locus variant with 1 repetition difference. P1 indicates the egg producer implicated in the tiramisu food poisoning. A, amoxicillin; S, streptomycin; Sp, spectinomycin; C, chloramphenicol; Su, sulfonamide; Te, tetracycline; Tmp, trimethoprim; Na, nalidixic acid. *Auto sampling; †authority sampling I; ‡tiramisu consumption; §authority sampling II.

Figure

Figure

Minimum-spanning tree of multilocus variable number tandem repeat analysis (MLVA) of Salmonella enterica serotype

1

,4,[5],12:–:– strains isolated from humans and nonhumans during 2001–2009, France. Each MLVA type is indicated by 1 node or branch tip, displayed as circles that are connected by branches of minimum-spanning tree. The length and the color of the branches represent genetic distances (changes in loci) between 2 neighboring types. The sizes of the different color circles depend on their population size. Wedges in circles indicate the proportion of isolates from respective sources with a particular MLVA type. A complex is shown in the black rectangle, based on maximum neighbor distance of changes at 2 loci and minimum size of 2 types. This specific complex linked the tiramisu food poisoning strains and other loci-derived strains for 2005–2009.

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