Figure 1. Tree diagram showing the genetic relatedness of 39 nontypeable H. influenzae isolates with mutations in the ftsI gene (gBLNAR n = 36 and gBLPACR n = 3) obtained by PFGE according to Dice's similarity index.
Dice coefficients are shown above the tree diagram. Isolates with ≥80% relatedness are considered highly genetically related.