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Phylogenetic analyses of tcdA and tcdB. The Clostridium sordellii cytotoxin gene (GenBank accession number X82638) was used to root the phylogenetic trees of tcdA (left) and tcdB (right). Clades are represented by different colors, and A− B+ clades are marked with asterisks. Clade 1, as a new lineage, is distinguished from the older cluster, comprising clade 2 to clade 6, which is marked by a gray square.
