Hey, Hijinks,
I know that antibiotics can really lower the amount of "good" bacteria in the body, (specifically in the gut/intestines) and that weakens the immune system, making it more much more prone to yeast and fungal infections.
This actually happened to a friend of mine, she was treated with an outrageous amount of antibiotics for a mild sinus infection and she had severe yeast infections for the next two years, and there wasn't any Western doctor that knew what the heck was going on. She was constantly sick on top of the yeast thing, and is only just now, three and a half years later, starting to get better. No more antibiotics, Lots of natural yogurt and stuff with natural cultures helped, as did watching what she eats that is treated with antibiotics ( organic meats!).
I don't know how it can all affect reptiles, and I don't think you can really feed them dairy because they're not mammals so they don't really digest lactose, but I can ask my vet when I go Saturday.
Maybe you could also call and/or ask a zoo? Maybe because they've got such a range of critters that it might be something someone has seen before in another animal. Good luck, just one more day and Ping will hopefully be right-as-rain soon!
