Figure 1.

Pulsed-field gel-electrophoresis profiles of Escherichia coli isolates of all 6 human household members. Isolates were from a urine sample of the index patient and fecal samples of all household members from 3 different occasions over a 19-week period. Horizontal lines separate different pulsotypes (ie, strains). Note the index patient's urine isolate near top of dendrogram, interposed among fecal isolates of pulsotype 903. Scale is percentage of similarity according to Dice similarity coefficients. Sibling with urinary tract infection is child 3. Abbreviations: 1st, 2nd, and 3rd: first, second, and third round of fecal sampling; FQ-R, fluoroquinolone resistant; PFGE, pulsotype; ST131, sequence type 131.