I take measures to never catch any disease from my snakes or anything else for that matter. I always wash my hands after handling/cleaning and I have dedicated tools like tongs, scales scrubbing sponges etc that don't get used for anything but the snakes. I have had a couple mistakes happen, I guess the worst would be the squirt of piss I got directly in my mouth when popping a juvie once, I had no ill effects from it. I take the same measures to not get my snakes sick. Anyone that comes over must use some germ X before handling one of the snakes and my rats only come from reputable breeders.