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- W4200505952 abstract "BACKGROUND: Distinguishing TB relapse from re-infection is important from a clinical perspective to document transmission patterns. We investigated isolates from patients classified as relapse to understand if these were true relapses or re-infections. We also investigated shifts in drug susceptibility patterns to distinguish acquired drug resistance from re-infection with resistant strains.METHODS: Isolates from pulmonary TB patients from 2009 to 2017 were analysed using whole-genome sequencing (WGS).RESULTS: Of 11 patients reported as relapses, WGS results indicated that 4 were true relapses (single nucleotide polymorphism difference ≤5), 3 were re-infections with new strains, 3 were both relapse and re-infection and 1 was a suspected relapse who was later categorised as treatment failure based on sequencing. Of the 9 patients who went from a fully susceptible to a resistant profile, WGS showed that none had acquired drug resistance; 6 were re-infected with new resistant strains, 1 was probably infected by at least two different genotype strains and 2 were phenotypically misclassified.CONCLUSIONS: WGS was shown to distinguish between relapse and re-infection in an unbiased way. The use of WGS minimises the risk of false classification of treatment failure instead of re-infection. Furthermore, our study showed that strains without major genetic differences can cause re-infection." @default.
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- W4200505952 date "2021-12-01" @default.
- W4200505952 modified "2023-10-09" @default.
- W4200505952 title "Whole-genome sequencing differentiates relapse from re-infection in TB" @default.
- W4200505952 doi "https://doi.org/10.5588/ijtld.21.0274" @default.
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