as every one has already said, good hygiene is they key or you could ask your vet to test for it. some antibacterial evaporating hand wash is great to keep near by.
personally i have handled my snake and dragon and eaten with out washing more than once and had no issues but its my choice to risk it, i really only use the hand wash after cleaning up waist, and or if i have handled my dragon and then go to handle my snake or vice verse but that does not happen very often at all