Fig 2.

Genetic relatedness among the 16 ncHi strains belonging to ST103, ST145, and ST139 by cluster analysis of the PFGE patterns. Similarity analysis was performed by using Dice's coefficient, and clustering was carried out by means of the unweighted-pair group mean association (UPGMA) method. Strains with a coefficient of similarity value of ≥80% were considered to belong to the same cluster (clusters A, B, C, and D). On the right, the strain, the sequence type (ST), the year of strain isolation, and the β-lactamase result (+ or −) are reported.