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Clustering dendrogram of M. pneumoniae clinical isolates based on SNP profiles at eight SNP loci. The dendrogram was constructed using the categorical coefficient and UPMGA clustering method (BioNumerics v.7.1) and included 140 clinical isolates, the eight genome-sequenced strains, and the reference strain M. pneumoniae M129. Each branch represents a unique SNP profile. The genotype frequencies are indicated in parentheses. The relationship with the P1 type is also represented.
