If you contracted this you would be shitting through the eye of a needle for a week or more unless you get the correct meds.
When I got it, went to the doctors, made me supply samples, tests came back and said what it was.
Can be food poising, anal sex or catching it from dogs (ok some WGs can be classed as dogs but don't think the doc meant it that way, and as I don't have dogs not that, and no anal sex)
Comes on from 2 days to 2weeks after contamination.
Medication soon sorted it out