You’ve probably been laid up with a cold or flu dozens of times in your life, but how much do you really know about the bugs that cause these illnesses?

“If I was not a medical person, I might not worry much about bacteria and viruses, I would probably lump all germs into one big category as ‘bad’,” says Dr. Brian Schwartz, director of Emergency Management Support for the Ontario Agency for Health Protection and Promotion. “But what they do is related to their microbiology, so it’s helpful knowing a bit more about them.”

Take our cold and flu quiz and test how much you really know about the germs that have plagued you all your life.