Cats have just as much potential to spread samonella, if not more. Not to mention, you're probably more likely to contract it in the kitchen with meat than your reptile.
Point is, wash before you handle your reptile to protect them, wash after you handle your reptile to protect you. Should be standard proceedure anyways, not only for reptiles, but for ALL pets. People don't wash nearly as much as they should.
Keep a bottle of instant hand sanitiser in yoru reptile room. Better yet, keep them in several rooms in your home. I try and santize everytime I walk by one.