Students = Germs

I have standard "Don't come to class sick" and "Don't tell me you're sick in person" clauses in my syllabus, but these don't really cover being sick and not knowing that you're sick. So there have been 2 cases of bacterial meningitis diagnosed on campus. They're letting faculty and students who teach/have class with the two know their risk, but with a 2-10 day incubation period, I'm not convinced that that's enough. I don't want to be infected by someone who is unaware that s/he is sick!! I would be worried anyway about transporting germs home (hence the clause), but being pregnant, this is really worrying me. :P