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Genomic analyses of Francisella tularensis strains confirm disease transmission from drinking water sources, Turkey, 2008, 2009 and 2012
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2015 (English)In: Eurosurveillance, ISSN 1025-496X, E-ISSN 1560-7917, Vol. 20, no 21Article in journal (Refereed) Published
Abstract [en]

Waterborne epidemics of tularaemia caused by Francisella tularensis are increasingly reported in Turkey. We have used whole genome sequencing to investigate if F. tularensis isolated from patients could be traced back to drinking water sources. Tonsil swabs from 33 patients diagnosed with oropharyngeal tularaemia in three outbreaks and 140 water specimens were analysed. F. tularensis subsp. holarctica was confirmed by microagglutination and PCR in 12 patients and five water specimens. Genomic analysis of three pairs of patient and water isolates from outbreaks in Sivas, Corum, and Kocaeli showed the isolates to belong to two new clusters of the F. tularensis B. 12 genetic clade. The clusters were defined by 19 and 15 single nucleotide polymorphisms (SNPs) in a multiple alignment based on 507 F. tularensis genomes. One synonymous SNP was chosen as a new canonical SNP (canSNP) for each cluster for future use in diagnostic assays. No SNP was identified between the genomes from the patient-water pair of isolates from Kocaeli, one SNP between the pair of isolates from Sivas, whereas the pair from Corum differed at seven SNPs. These results illustrate the power of whole genome sequencing for tracing F. tularensis patient isolates back to their environmental source.

Place, publisher, year, edition, pages
2015. Vol. 20, no 21
National Category
Infectious Medicine
Identifiers
URN: urn:nbn:se:umu:diva-106504ISI: 000355878200003OAI: oai:DiVA.org:umu-106504DiVA: diva2:842003
Available from: 2015-07-16 Created: 2015-07-14 Last updated: 2017-12-04Bibliographically approved

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Johansson, Anders
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Department of Clinical MicrobiologyMolecular Infection Medicine Sweden (MIMS)
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CiteExportLink to record
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