Salmonella is indeed a bacterium that lives in the intestines and has been cultured in almost every species of reptile that they've looked at. The main danger of salmonellosis is in immunocompromised people (HIV, chemotherapy), the very young and the very old. Most people would have a 24-48 hour case of mild diarrhea and cramps. The thing with the turtles was that they do tend to swim in very dirty water, particularly years ago when there were no filters that were close to strong enough to handle an aquatic turtle tank. And some little kids popped the little turtles in their mouths, thus leading to the 4" rule on turtle sales.
Please realize that of course no matter how fastidious one is regarding cage cleaning, there will be a time when the cham defecated, it catches in a leaf, and he might rub his head on it as he goes by. But as long as you have a healthy immune system and are doing a dry kiss (let's not French kiss our chams, people. Unless you have a cricket in your tonsil and need help getting it out ;-) ), you will probably be ok 99% of the time. But one of a hundred of you may get the runs!!
dr. o-