Thanks for the responses, OldHat, Summerstorm, Suebear. I had thought that it wasn't really worth worrying about since "avoiding sick people," as Old Hat said, is ridiculous.
I'll stick to washing my hands and trying not to touch my face absent-mindedly!
UC for the last ten years
Current Meds: 6MP since 2006, Lialda, Asacol foam, Lomotil
Past Meds: You name it; I've tried it. (Asacol, Colazol, Pentasa, DiPentum, Rowasa, Canasa, Cortenema, sulfasalazine, Cortifoam)
Alternative treatments I have had success with: Acupuncture, Hypnotherapy