Figure 1 Principle coordinates analysis plot for 127 Escherichia coli isolates from the SENTRY and Meropenem Yearly Susceptibility Test Information Collection.

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Figure 1 Principle coordinates analysis plot for 127 Escherichia coli isolates from the SENTRY and Meropenem Yearly Susceptibility Test Information Collection (MYSTIC) programs (2007). The principle coordinates analysis was based on 60 virulence genes. Coordinates 1 and 2 capture 34% and 32% of variance in the dataset, respectively (total, 66%). Fifty (93%) of the 54 ST131 were placed within the region of the plane encircled by the dashed line, which contained no non-ST131 isolates. ESBL, extended-spectrum β-lactamase; FQ-R, fluoroquinolone resistant; FQ-S, fluoroquinolone susceptible. Subsets 1–4 were defined according to ESBL, bla<sub>CTX-M-15</sub>, and FQ resistance status. The ST131 isolates (n = 54) included representatives from subsets 1–3. From: Escherichia coli Sequence Type ST131 as the Major Cause of Serious Multidrug-Resistant E. coli Infections in the United States Clin Infect Dis. 2010;51(3):286-294. doi:10.1086/653932 Clin Infect Dis | © 2010 by the Infectious Diseases Society of America

Figure 2 Dendrogram of pulsed-field gel electrophoresis (PFGE) profiles for 127 Escherichia coli isolates from the SENTRY and Meropenem Yearly Susceptibility Test Information Collection (MYSTIC) programs (2007). Fifty-three (98%) of the 54 ST131 isolates occurred within the cluster enclosed by the dashed rectangle, with no interposed non-ST131 isolates. Branches leading to ST131 isolates are bolded. Heavy vertical bars to the right of the PFGE profiles identify groups of isolates with the same pulsotype. Bullets identify isolates that are ST131, exhibit CTX-M-15 or another extended-spectrum β-lactamase (ESBL), and/or are fluoroquinolone resistant (FQ-R). Dendrogram was inferred according to the unweighted pair group method with averaging on the basis of Dice similarity coefficients. From: Escherichia coli Sequence Type ST131 as the Major Cause of Serious Multidrug-Resistant E. coli Infections in the United States Clin Infect Dis. 2010;51(3):286-294. doi:10.1086/653932 Clin Infect Dis | © 2010 by the Infectious Diseases Society of America

Table 1 Characteristics of 127 Escherichia coli Isolates from the SENTRY and Meropenem Yearly Susceptibility Test Information Collection (MYSTIC) Collections (2007), According to Extended-Spectrum β-Lactamase (ESBL) and Fluoroquinolone Phenotype and bla<sub>CTX-M-15</sub> Status. From: Escherichia coli Sequence Type ST131 as the Major Cause of Serious Multidrug-Resistant E. coli Infections in the United States Clin Infect Dis. 2010;51(3):286-294. doi:10.1086/653932 Clin Infect Dis | © 2010 by the Infectious Diseases Society of America

Table 2 Resistance Scores among ST131 and Non-ST131 Escherichia coli Isolates within 4 Resistance-Associated Subsets From: Escherichia coli Sequence Type ST131 as the Major Cause of Serious Multidrug-Resistant E. coli Infections in the United States Clin Infect Dis. 2010;51(3):286-294. doi:10.1086/653932 Clin Infect Dis | © 2010 by the Infectious Diseases Society of America

Table 3 Estimated Contribution of ST131 to Antimicrobial-Resistant Escherichia coli Populations, 2007 From: Escherichia coli Sequence Type ST131 as the Major Cause of Serious Multidrug-Resistant E. coli Infections in the United States Clin Infect Dis. 2010;51(3):286-294. doi:10.1086/653932 Clin Infect Dis | © 2010 by the Infectious Diseases Society of America

Table 4 Molecular Characteristics of 54 Escherichia coli ST131 Isolates and 73 Geographically Matched Controls, According to Antimicrobial Resistance Subset From: Escherichia coli Sequence Type ST131 as the Major Cause of Serious Multidrug-Resistant E. coli Infections in the United States Clin Infect Dis. 2010;51(3):286-294. doi:10.1086/653932 Clin Infect Dis | © 2010 by the Infectious Diseases Society of America

Table 5 Virulence Scores of 54 Escherichia coli ST131 Isolates and 73 Geographically Matched Controls, by Antimicrobial Resistance Subset From: Escherichia coli Sequence Type ST131 as the Major Cause of Serious Multidrug-Resistant E. coli Infections in the United States Clin Infect Dis. 2010;51(3):286-294. doi:10.1086/653932 Clin Infect Dis | © 2010 by the Infectious Diseases Society of America