i wonder about this too, having a collection of give or take 30 ball pythons, if they are being potentially reinfected with parasites with every meal, i can't be going to the vet once a month and having them all dewormed. i wonder what is the consensus on parasites with big breeders? i understand deworming a WC animal when it is imported, but unless they are leaving visible parasites or losing too much weight, parasite control seems like a lost cause for those who don't breed their own rodents.