Worried about the flu’s effect on your workforce? According to the Centers for Disease Control and Prevention, the annual costs of influenza in the United States are $4.6 billion. What’s more, the flu leads to losses of up to 111 million workdays and $7 billion in sick days and lost productivity. Flu season is in full swing, and if you want to keep your workers safe, comfortable and productive, you’ll need to put in play a few specific policies. Following are our top strategies for preventing the flu this year.