With the flu season upon us, many workers are getting sick. A Ball State University researcher says that businesses should take precautions in advance of the annual flu season to keep sick workers home and reduce infection rates that send people to physicians in droves. Erik Nesson, an Associate Professor of Economics at Ball State, said labor market-based activities, such as using public transportation and carpools, working in offices, putting children in daycare, and having frequent contact with the public, might help spread the flu.