Photo Modified: Flickr / University of the Fraser Valley / CC BY 4.0

Educate your employees on the signs of the flu, some of which include cough, fever and headache. Make sure they are aware of the ways to prevent the flu, such as washing your hands and cleaning work surfaces. Educate them on the importance of getting the flu shot, and let them know that if they need to stay home because they are sick, it is okay.