The flu season usually begins in October, and sometimes as late as November. This year, the flu season has started early. There have already been 2 confirmed cases in Jefferson County, KY. What does this mean for the Clarksville area? It is a good reminder to prepare yourself for the flu season. The best way to prevent the flu is to get the yearly flu vaccine. Also, wash your hands often, the influenza virus is easily transferred from person to person.