I keep falling sick over and over again

I keep falling sick like every 2 months or so. Everytime some guy sitting near me who's sick, coughs/sneezes without covering his mouth and the next day I wake up feeling sick. I had the most horrible flu in November, and now I have a cold again, and I just got here. I'm now just paranoid about where I sit in class, and try to sit someplace isolated. I think people who are sick should have the basic courtesy to stay inside their halls or wear masks while out in public.