Yoj would think all that flouride would knock them out or at least turn them into regular amoebas, not brain eaters.The clorination process at the water plant isn't sufficient to kill amoebas?
Anyway: https://www.medicinenet.com/naegleria_infection/article.htm
Naegleria fowleri infects people when warm freshwater, containing amebae, forcefully enters the nose. This can occur through water-related activities, including recreational swimming, jumping, or diving. Sports like water skiing or tubing behind a boat are a risk.
Swallowing contaminated water does not cause this brain-eating infection.
First death....
Although I should probably check with coiled first before I make what could be considered by someone as an alarmist post, I think its newsworthy and sadly informative to report one child just died from this mess.
Natural immunity.....
3 of 11 samples tested positive, correct? So they are in the water there?