Absolutely some can. The one that people often refer to is salmonella. And no, not all reptiles carry this. That being said, you always want to follow basic good habits. Always wash your hands after handling your pet, just like you would wash your hands after cleaning up after your dog or cat, which carry many more diseases which can pass to people than reptiles do. Keep in mind, you are much more likely to get salmonella from the chicken you are making for dinner than from your pet.