Personally, I wouldn't care if one of 'them' sneezed on me... but that all depends on your religion, too, I guess.
Buddhist- Get some insence (cant spell that word) and cleanse yourself.. Then again, a buddhist would say, "Dear person, I do not mind that I had been sneezed on.. its jsut the circle of life"
Christian- Confess and ask for a little holy water to put on you
Athiest- Go out with them
Jew- Im not really sure :)
**'I wasnt insulting buddhists just to let you know... im one