I'm trying to think how a HIV positive surgeon would pose a risk to their patients - I can only assume the concern would be blood-to-blood contact due to an abrasion or broken skin on the surgeon coming into contact with the patient's open wound. Or perhaps slippage of a sharp implement wounding the surgeon and then bleeding into the patient...

Um, I guess there's a very small risk. Seems like it would almost be no-risk if the surgeon double or triple gloved.

I don't think I personally see a problem with it...I wouldn't feel like I was at risk being operated on by a surgeon with HIV.