I can tell you first hand, we bought a dragon, at the time we did not know that it orignated from a Fluker's breeding facility in Central America, it had a small spot on its foot and then belly that turned out to be a fungal infection, then we found it also had it internally..... it was doomed from before we had it. After it died a necropsy showed that it was loaded with Aspergilus mold fungus.... the same mold fungus that has been traced to dry cricket food with a corn base that develops when it gets damp. We had many other dragons, none had a problem or this fungus, the only difference was this one arrived to us with the fungus on and in him, from an area that is noted for dampness. By the Flukers own statement they were fed their crickets that were fed their products.
Ours was not the only one that had the same problems or large amounts of Flukers hatched and rasied animals dying. Or reptiles dying in mass after being fed their crickets or their gutload used. Where does the problem originate, I am not sure, but I would think it is either the enviroment they are rasied in, the crickets they are fed or the gutload that goes into their crickets.... I will leave you to decide if it could be any or all of these.