Here's a tip from a nurse of my acquaintance:

Make sure the staff washes their hands before they touch you. Otherwise they can spread stuff from people who are really sick to you.

It would probably be nice if they cleaned the stuff they stick you with, prod you with, and in general use on you. Especially rectal thermometers, enemas and things like those. You want to be sure that the thermometer they stick in your mouth is the kind that's for sticking in your mouth, too. You might want to check that yourself.