Clostridioides difficile R20291 is the most studied PCR-Ribotype 027 isolate. The two predominant lineages of this hypervirulent strain, however, exhibit substantive phenotypic differences and possess genomes that differ by a small number of nucleotide changes. It is important that the source of R20291 is taken into account in research outcomes.
Keywords: Biofilm; Clostridioides difficile R20291; Conjugation; Genomic variation; Motility; Toxin production.
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