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. 2016 Mar;22(3):442–448. doi: 10.3201/eid2203.151136

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Dendrogram of the predominant Bordetella pertussis pulsed-field gell electrophoresis (PFGE) profiles currently circulating in the United States. Clusters were determined by using unweighted pair group method with arithmetic mean (UPGMA) with 1% band tolerance and optimization settings. Box indicates area of band analysis (125 kb–450 kb). *Indicates the predominant B. pertussis PFGE profiles currently circulating in Europe, as reported by Advani et al. (12). In the area of band analysis, these profiles (BpSR3, BpSR10, BpSR11, BpSR5, and BpSR12) were indistinguishable from US profiles CDC002, CDC010, CDC013, CDC046, and CDC082, respectively. Scale bar indicates percentage similarity.