The dreaded bugs...

[Maixx]

Depending on what kind of substrate and where you get it, they can get transmitted that way.
Example: aspen from Petco, that has a mite infestation can carry mites or eggs.

I treat my new substrate with PAM every time I change it out as a preventative measure.

[kristan]

Thanks, I thought about that as well, but I use paper for half of my critters and the other half (my gtps) do not have any substrate. I do however have potting soil and sphagnum moss. I bought the moss back in March, and it has been used a few times in my gtp cages, which are mite free. I never used it in the infected cage but I'm guessing that snake probably came in pretty close contact with it at some point.

[bkelley02]

I treat my new substrate with PAM every time I change it out as a preventative measure.

I do the same thing.