Chytrid is indeed a scary issue and poor husbandry can lead to some very bad situations. When I do fieldwork I am purposely putting myself into the arms of chytrid and sites where it is very prevalent. I have to make sure I scrub myself clean and my gear as well to make sure I don't hurt my poor amphibians at home. Also about the issue of heat intolerance in chytrid, it is nice that it is easy killed this way sadly many of our beloved amphibians also can't take the heat. STL zoo had their hellbender collection get some infection and through slowly raising all the tank temps over a series of days they were able to kill the chytrid while allowing the hellbenders to slowly adapt to the change. Once the temps came back down the chytrid was gone and the hellbenders were fine. Also on a field note we see a lower rate to almost a no cases of infection in those amphibians who don't become active until warmer temps. Mostly hylids here. This isn't something that is a 100% fact but the evidence seems to be leaning that way.