Very scary. We have a wonderful farm pond. We don’t swim per se but we float. Up until this week though it was actually cold. It’s spring fed and very local watershed but birds could bring it in. How do we test for it?
http://www.cdc.gov/parasites/naegleria/diagnosis.html
I’d send a sample to a lab, but if you know what to look for, maybe you could see them in a microscope.