I can tell you that you are more likely in your lifetime to contract salmonella from some spinach from the grocery store then you are from your reptiles.
Of course that doesn't mean that you shouldn't practise good hygiene however it is true regardless of the animal you are dealing with, common sense would tell you that you should watch your end after handling your snake, but it applies to other animals as well.
Salmonella in reptiles is one of the "bogeyman" used by HSUS on why reptiles are not suitable pets when chances of contracting salmonella from your reptiles is very small.