1. Outbreak investigation for toxigenic Corynebacterium diphtheriae wound infections in refugees from Northeast Africa and Syria in Switzerland and Germany by whole genome sequencing.
- Author
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Meinel DM, Kuehl R, Zbinden R, Boskova V, Garzoni C, Fadini D, Dolina M, Blümel B, Weibel T, Tschudin-Sutter S, Widmer AF, Bielicki JA, Dierig A, Heininger U, Konrad R, Berger A, Hinic V, Goldenberger D, Blaich A, Stadler T, Battegay M, Sing A, and Egli A
- Subjects
- Adolescent, Adult, Africa epidemiology, Bacterial Toxins metabolism, Bacterial Typing Techniques, Corynebacterium diphtheriae drug effects, Corynebacterium diphtheriae isolation & purification, Diphtheria drug therapy, Drug Resistance, Multiple, Bacterial genetics, Female, Genes, Bacterial, Germany epidemiology, Humans, Male, Multigene Family, Multilocus Sequence Typing, Phylogeny, Refugees, Switzerland epidemiology, Syria epidemiology, Wound Infection drug therapy, Wound Infection microbiology, Young Adult, Bacterial Toxins genetics, Corynebacterium diphtheriae genetics, Diphtheria epidemiology, Disease Outbreaks, Wound Infection epidemiology
- Abstract
Toxigenic Corynebacterium diphtheriae is an important and potentially fatal threat to patients and public health. During the current dramatic influx of refugees into Europe, our objective was to use whole genome sequencing for the characterization of a suspected outbreak of C. diphtheriae wound infections among refugees. After conventional culture, we identified C. diphtheriae using matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) and investigated toxigenicity by PCR. Whole genome sequencing was performed on a MiSeq Illumina with >70×coverage, 2×250 bp read length, and mapping against a reference genome. Twenty cases of cutaneous C. diphtheriae in refugees from East African countries and Syria identified between April and August 2015 were included. Patients presented with wound infections shortly after arrival in Switzerland and Germany. Toxin production was detected in 9/20 (45%) isolates. Whole genome sequencing-based typing revealed relatedness between isolates using neighbour-joining algorithms. We detected three separate clusters among epidemiologically related refugees. Although the isolates within a cluster showed strong relatedness, isolates differed by >50 nucleotide polymorphisms. Toxigenic C. diphtheriae associated wound infections are currently observed more frequently in Europe, due to refugees travelling under poor hygienic conditions. Close genetic relatedness of C. diphtheriae isolates from 20 refugees with wound infections indicates likely transmission between patients. However, the diversity within each cluster and phylogenetic time-tree analysis suggest that transmissions happened several months ago, most likely outside Europe. Whole genome sequencing offers the potential to describe outbreaks at very high resolution and is a helpful tool in infection tracking and identification of transmission routes., (Copyright © 2016. Published by Elsevier Ltd.)
- Published
- 2016
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