{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,7]],"date-time":"2026-03-07T17:20:51Z","timestamp":1772904051949,"version":"3.50.1"},"reference-count":75,"publisher":"Microbiology Society","issue":"9","license":[{"start":{"date-parts":[[2023,9,15]],"date-time":"2023-09-15T00:00:00Z","timestamp":1694736000000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,9,15]]},"abstract":"Respiratory diphtheria is a serious infection caused by toxigenic \n \n Corynebacterium diphtheriae<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic>, and disease transmission mainly occurs through respiratory droplets. Between 2017 and 2019, a large diphtheria outbreak among forcibly displaced Myanmar nationals densely settled in Bangladesh was investigated. Here we utilized whole-genome sequencing (WGS) to characterize recovered isolates of \n \n C. diphtheriae<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> and two co-circulating non-diphtheritic \n \n Corynebacterium<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> (NDC) species \u2013 \n \n C. pseudodiphtheriticum<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> and C. propinquum. C. diphtheriae<\/jats:italic> isolates recovered from all 53 positive cases in this study were identified as toxigenic biovar mitis, exhibiting intermediate resistance to penicillin, and formed four phylogenetic clusters circulating among multiple refugee camps. Additional sequenced isolates collected from two patients showed co-colonization with non-toxigenic \n \n C. diphtheriae<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> biovar gravis, one of which exhibited decreased susceptibility to the first-line antibiotics and harboured a novel 23-kb multidrug resistance plasmid. Results of phylogenetic reconstruction and virulence-related gene contents of the recovered NDC isolates indicated they were likely commensal organisms, though 80.4\u200a%(45\/56) were not susceptible to erythromycin, and most showed high minimum inhibition concentrations against azithromycin. These results demonstrate the high resolution with which WGS can aid molecular investigation of diphtheria outbreaks, through the quantification of bacterial genetic relatedness, as well as the detection of virulence factors and antibiotic resistance markers among case isolates.<\/jats:p>","DOI":"10.1099\/mgen.0.001085","type":"journal-article","created":{"date-parts":[[2023,9,15]],"date-time":"2023-09-15T14:16:39Z","timestamp":1694787399000},"source":"Crossref","is-referenced-by-count":3,"title":["Genomic characterization of cocirculating Corynebacterium diphtheriae and non-diphtheritic Corynebacterium species among forcibly displaced Myanmar nationals, 2017\u20132019"],"prefix":"10.1099","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9850-5175","authenticated-orcid":false,"given":"Lingzi","family":"Xiaoli","sequence":"first","affiliation":[{"name":"Present address: Division of Foodborne, Waterborne, and Environmental Diseases, National Center for Emerging and 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