Summary of EC Study Exposure and Outcome Measurements.

EC: Escherichia Coli; CC: Case Control; MF: Membrane Filtration; MPN: Most Probable Number; NR: Not Reported; C: Celsius; DHSS: Department of Health & Social Security: The bacteriological examination of water supplies; APHA: American Public Health Association: Standard Methods for the Examination of Water and Wastewater; MOE: Ministry of Environment: Ontario's Drinking Water Objectives.aUnless noted, used a definition consistent with World Health Organization recommendation of 3 or more loose/watery stools in 24 hour period;bAcute Gastrointestinal Illness: 1) vomiting or liquid diarrhea or 2) nausea or soft, loose diarrhea combined with abdominal cramps;cDiarrhea with or with out vomiting;dselective medium: “containing chromogenic and fluorogenic b-glucuronide and b-galactoside substrates”;eMultiple EC enumeration methods used – we report the method with the largest sample size and for which the authors report an extractable RR;fIncubation temperature.Summary of EC Study Exposure and Outcome Measurements.