Just learned that I spent 2 hours today, unknowingly, seated 1 foot away from a coworker with terrible stomach flu.
if it makes you feel any better, stomach flu is often plain old food poisoning [e.g. non-contagious].
notthatothergary
says
He told me (after the meeting) that he caught it from his infant daughter. 
notthatothergary
says
But I still hope you are right.