Don’t ask me to be your dive buddyThat amoeba is not "new" it's been around a long time. When I was a kid (and swam around in hot FL lakes all the time), we knew a kid that died from it. We never worried about it. You have about the same odds of getting eaten by a gator. Which we also never worried about.
I've gotten some nasty skin rashes from swamps that would make brain eating amoeba sound pleasant.