FIG. 2.

Dendrograms of DraI and AseI PFGE patterns of single isolates from 38 patients, M. abscessus^T ATCC 19977, M. chelonae^T ATCC 35752, M. immunogenum^T ATCC 700505, M. massiliense^T CCUG 48898, M. bolletii^T CCUG 50184, and three previously studied isolates, INCQS 594, B52, and B67 (19, 28). Dendrograms were prepared using the BioNumerics (version 5.1) program by the Dice unweighted-pair group method with arithmetic means, based on 2% optimization and position tolerance. Isolates with highly similar (up to three band differences) PFGE patterns are boxed. Boxes A, isolates showing high degrees of similarity to surgical epidemic isolates; boxes B, indistinguishable patterns for isolates from three patients from different cities in SP; boxes C, isolates highly similar to a postinjection isolate from PA. Numbers at the upper left are percent similarity.