I would go with your comfort level...I was an elementary school teacher while pregnant with my little girl and I was certainly exposed to just about everything, I'm sure (I taught French, so I had about 180 students). While I was as careful as possible (washed hands frequently and used purell liberally), I was always scared something awful would happen and even stayed home during the fifth disease and flu outbreaks (b/c they were during my 1st trimester). You can't exactly glove and gown as a teacher

. If you feel like you would never forgive yourself if something were to happen, I would pass. That said, you know the proper percautions and from a strictly unemotional perspective, there shouldn't be a problem with it...I hope that makes sense.
oops, sorry, just saw the date on that post
Let me know what you decided and how it's going!
Carrie