Cause of the outbreak |
Number of probable and confirmed cases |
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Microorganism(s) involved in the outbreak (identify as suspected or confirmed) |
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Contributing cause(s) of the outbreak |
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Investigation methods used to confirm outbreak (e.g. stool or water samples, interviews of ill persons, or water system assessment) |
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Environmental sampling information (water testing, methods used, number of samples collected, time delay between outbreak notification and sample collection, local hydrogeology) |
Size of the water system |
Number of people served per day/week |
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Flow rate |
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Number of connections to the water supply |
Characteristics of the water system |
Water source (e.g. ground or surface) and description (e.g. well or spring) |
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Water treatment (type of disinfection and filtration specified) |
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Setting of exposure (i.e. premises type) |
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Months the water system is in operation |