Figure 5. Escherichia coli O157 and Shiga toxin–producing non-O157 E. coli infection in humans in Scotland identified or confirmed by the Scottish E. coli O157/VTEC Reference Laboratory, Edinburgh, UK, by financial year (April–March). Samples include isolates, feces, and serum. Non-O157 isolates were serotyped by the Laboratory of Gastrointestinal Pathogens. Data are presented as percentage of all cases in humans that are E. coli O157 (blue), Shiga toxin-producing non-O157 (excluding E. coli O26) (yellow) and Shiga toxin–producing E. coli O26 (pink). The mean number of cases per financial year during 2006–2011 was 248 (221–275). This time frame was selected to ensure application of consistent method.