A child who tested positive for E. Coli who had played at the Lake Shore Athletic Club caused the Clark County health department to close down the club for disinfection. Since the closure, no one else had tested positive for E. coli.
But this could be because not all parents had tested their children. People possibly exposed to E. Coli should be tested even without symptoms, which can include nausea, vomiting and diarrhea that may be bloody. This is because people infected with E. coli can still transmit the bacteria even if they aren’t symptomatic.