Now that I think of it, I do need to change my profile pic. But here goes anyways.
The one I have currently is a micrograph of naegleria fowleri. At the time that I chose it, I was going through a phase where I was particularly afraid of it. Although it is extremely rare, it is also has an extremely high mortality rate and there is next to nothing that doctor's can do to help you once it's inside your brain.
Although it's found primarily in fresh water and thrives in the heat, it has been rarely found in supposedly "clean" water sources, such as water parks, wells, pipes, hot water systems, etc.
Where I live now, it has not been found. So it is much less of a concern. But with global warming, who knows?
I don't think about it much anymore though. It used to seem like it was on the news all the time a few years ago. People got it and died just from swimming; in freaking water parks of all places. And people were worried about the pee.
If you like swimming and you live in a hotter state, wear nose plugs.