This was a few years ago – he was ok, just a messy affair for a few days.
Evidently no one noticed (or, reported) anything. My son figured it out later (initially he thought it was mud or leaves because why would any sensible person take a crapping toddler into a public pool?).
When we found out it was salmonellosis, and figured out how he got it, I called the pool, suggested that they do better enforcement of their own swim diaper rule, and got a noncommittal response. I guess the pediatrician’s office notified the health department about my son’s case, because they called me in a day or two. I gave 'em the pool’s phone number (they agreed that’s probably what had happened).
(At that point in time, we could fairly much rule out vectors like salad and raw vegetables.)
