Influenza viruses, AKA the “Flu Krew,” are viruses spread mainly by coughs and sneezes. If you get sick with these viruses, you may have a fever, cough, sore throat, runny or stuffy nose, body aches, headaches, chills, or tiredness. The Flu Krew roams the globe, appearing in the United States during flu season, which can happen between October and May. The members of the Flu Krew, called viruses, usually change a little bit each year. Scientists and flu experts keep a close watch on the Flu Krew and work with doctors and others to help protect us from flu. The best way to prevent flu is with a flu vaccine, but there also are medicines to treat flu