Originally Posted by Jdy2222:
After many phone calls to DCF, the state health department, and finally to the county health department I've learned a bit.
The e. coli this child has is not the "bad" e. coli ... so as soon as his bowels return to normal he's able to come back - no need for follow up samples. 
Whew.
I went through this exact situation and was told the same thing. It ended up being totally fine and no one else got it. Their best guess was that it was from stagnant water the child had been drinking while camping. Just in case that helps ease your mind!