Do you ask your clients to wash their hands when they enter your room?
I have begun a new thing. I cannot stand or afford to be sick (not that anyone enjoys it) and so for the past month when a client enters I hug him and say "let's freshen up a bit, shall we" lead him to the bathroom and wash our hands together--washing his, caressing his hands and moving my hands all around his fingers (to get to as many flu germs as possible). They seem to see this as "sensual" as I've had two even use that word. Warm water and soap suds, yeah, it's a sexy bubble bath for our hands.
It's actually working as part of my ice-breaking beginnings though so it's all good.
I know this doesn't stop us from catching everything but with the conjunctivitis post I just read I thought I'd go ahead and post the suggestion anyway.