I've been using wood cages forever and the only animal I've ever lost from infection was one that I kept in a glass aquarium (young blood python). I think that the benefits of wood greatly outweigh the possibly negative aspects. I'd guess that bacteria or mold build up problems generally come from a lack of maintenance or too small of a cage. My balls live in 16 cubic feet of comfort so there isn't the build up that comes from a tiny space. If I was housing them at 90% humidity all the time, then I'd just lacquer or paint the interior.
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Ball Pythons 1.1 (Morty & Mary)
Amazon Tree Boas 1.1 (Orville & Aeme)
Corn Snakes 2.2 (Bob, Sandy, Candy, and Tye)
Leopard Geckos 1.2 (Leo, Spaz, and Spot)
Central Painted Turtle 1.0 (Swim)
Red-Eared Slider 0.0.1 (Harold)

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