Dear Doctors: I got sick with a stomach bug, and it was so bad that my girlfriend insisted on me going to our local urgent care. They said I had norovirus. It lasted for three days, and it was miserable. Where does norovirus come from, and how can you avoid getting it?
Dear Reader: Being sick with any kind of stomach bug is deeply unpleasant. That said, norovirus is a notoriously nasty one. The sym…