Chester infections in Europe, summers 2014 and 2015

Abstract : Disease Prevention and Control was informed of an increase in numbers of Salmonellaenterica serotype Chester cases with travel to Morocco occurring in six European countries. Epidemiological and microbio-logical investigations were conducted. In addition to gathering information on the characteristics of cases from the different countries in 2014, the epidemiological investigation comprised a matched case–case study involving French patients with salmonellosis who travelled to Morocco that year. A univariate conditional logistic regression was performed to quantify associations. The microbiological study included a whole genome sequencing (WGS) analysis of clinical and non-human isolates of S. Chester of varied place and year of isolation. A total of 162 cases, mostly from France, followed by Belgium, the Netherlands, Spain, Denmark and Sweden were reported, including 86 (53%) women. The median age per country ranged from 3 to 38 years. Cases of S. Chester were more likely to have eaten in a restaurant and visited the coast of Morocco. The results of WGS showed five multilocus sequence types (ST), with 96 of 153 isolates analysed clustering into a tight group that corresponded to a novel ST, ST1954. Of these 96 isolates, 46 (48%) were derived from food or patients returning from Morocco and carried two types of plasmids containing either qnrS1 or qnrB19 genes. This European-wide outbreak associated with travel to Morocco was likely a multi-source outbreak with several food vehicles contaminated by multidrug-resistant S. Chester strains.
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Eurosurveillance, European Centre for Disease Prevention and Control, 2017, 22, pp.30463. 〈10.2807/1560-7917.ES.2017.22.7.30463〉
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L Fonteneau, N Jourdan da Silva, Laétitia Fabre, P Ashton, M Torpdahl, et al.. Chester infections in Europe, summers 2014 and 2015. Eurosurveillance, European Centre for Disease Prevention and Control, 2017, 22, pp.30463. 〈10.2807/1560-7917.ES.2017.22.7.30463〉. 〈pasteur-01532210〉

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