Figure 5. Temporal patterns of cases of urinary tract infections (UTIs) with Escherichia coli clonal groups by week in Montréal, Québec, Canada, 2006 (A), and Berkeley, California, USA, 1999–2001 (B). Clonal groups are identified by letters in boxes. Lines indicate the total number of UTIs with E. coli in each week for each study site. Samples were not analyzed during February–October 2000 in Berkeley.