FIG. 1.

Dendrogram from ERIC analysis of 106 phylogenetic group B2 E. coli isolates from both first-UTI and rectal specimen collections. It is constructed with the unweighted pair group method using arithmetic averages with similarity matrices generated based on Pearson's correlation coefficient analysis of pairwise comparisons of ERIC patterns. Two major clusters are identified and labeled as I and II. The shaded triangles are collapsed branches in which all isolates are from the same collection (either urine or rectal). Numbers in parentheses are the number of isolates in each collapsed branch. The scale bar on the top indicates the similarity values. Abbreviations: R, isolates of rectal origin; U, isolates from urine.