I hear there are tons of people's beardies being hit hard with the yellow foot disease(I think thats what it's called). So keep on your toes for discolouration of their feet.
Actually, it's yellow fungus, and it doesn't just stay on their feet. It can be anywhere on their body. But you're right. It is something to be aware of. BE VERY CAREFUL!!!!!
If you click on the Adenovirus/Medical link on the left and scroll down the page a bit, there's some information on the yellow fungus.