I very rarely post because of how things tend to go in the forums but the link to this thread was sent to me by a few members and I took a good interest in it.
I think it is a good idea to worry about any zoonotic disease when working with any species of animal. Despite them looking apparently healthy, they can be carriers and thus infect us if we are not practicing proper hygiene methods. I have to say that the concern of contracting Salmonella from chameleons is a valid one although an extremely rare one. It seems to me more of an isolated personal issue/agenda than a true concern the way it was brought to the forum.
Do I agree with kissing a chameleon? No. I think chameleons are to be treated like fish, you keep them as happy as you can and you simply observe them from afar. With that said, most chameleon owners enjoy interacting with them and chameleons will tolerate the handling in many cases. If you kiss a chameleon's cloaca, you will most likely be playing with fire. Kissing its mouth might not pose such a grave issue. Chameleons are not known to be animals that crawl in their feces or roll in them, like most terrestrial or aquatic reptiles do, so giving them a peck shouldn't be as big an issue as it is being made out here. Again, I don't recommend it and you will never see me advising to do it, but I also have to be realistic as there are just as many chances to contract several types of bacteria from allowing a dog lick your face and lips. How many people do that? A lot. A dog will lick almost every part of its body and then you get a "surprise" lick as you don't really know where that tongue has been. The risk or "surprise" is not as bad with a chameleon.
A single Veterinarian will never know as much as the whole CDC indeed. However, the CDC depends on Vets and MD's to report cases to them so the CDC won't be of much help by itself either. The reports on salmonellosis in humans caused directly from chameleons in the USA are not making the statistics, but they are listed as a potential source. Why? Here's why:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC154656/
Allowing chameleons to free roam and not keeping the environment clean can cause issues like the above. Of course this case was in the UK but it can certainly happen here in the USA. I have placed a call and email to a friend of mine that works in the Vet Med School of UGA, and also worked for the CDC, in hopes to get more actualized info on salmonellosis from chameleons so we'll see if he can get back to me on that.
So in conclusion, don't go out of your way to engage in any kind of oral contact with your chameleon if you don't have to. If you do anyway, know the risks and definitely stay away from kissing their cloaca or licking your fingers after handling them. Clean after them and keep your cages clean as well. And if you are really worried, you can take a fresh fecal sample to your Vet to have analyzed for Salmonella. The test is usually done by an idependent lab and it is not really expensive; that way you'll know if your chameleon is harboring any strain of Salmonella.
Hope this helps those who asked for my input,
Ivan Alfonso, DVM