Shake or Not?

I've had the sinus blues that seem to be going around at the moment.

One question: When someone comes up to you and goes to shake your hand and you're sick, do you shake?

I had two instances today where I didn't and explained the situation. I remember watching this on "Seinfeld."

I think I made the right decision. I guess you could salute or tip a hat if you're wearing one.

What do you think?