D..
Never had a bearded dragon, but we had a lizard.
Please let me warn you about this one important thing, SY. Reptiles can carry salmonella. My kindergartner got salmonella while we had that lizard. We also went to a Wendy's and to a children's hospital right before he came down with it, and the health department had to investigate both of them. However, I did not know about the link between reptiles and salmonella, and the health department didn't ask me if I had reptiles and I didn't think to mention it. My child was sick for over 6 months because of it - salmonella is awful. Not as scary as ecoli, but still pretty darn scary.
Anyway, it's hard to find out the culprit of these food-bourne diseases by the time the health department starts their inquiries - usually the problem is gone by then (though they will certainly dig deeper for ecoli and if people are dying.) We don't know what caused it, really, and they don't think it was from my house because we hadn't been home eating much at the time.
So take precautions with your family for this, and find an exotic pet vet who you can talk to about it.
Good luck,
Dawn