"When you work in a close environment, if someone is not telling you to go home, they’re thinking it."

Experts are calling this flu season the worst in a decade, predicting that at least 20 percent of the population has fallen or will become ill. In the last few weeks, odds are that if you haven't had the flu, you know someone who has had it.

For businesses, a single flu-struck worker can have a domino effect. According to a new survey from the office supply company Staples, nearly 90 percent of office workers come to work even when they know they are sick. California-based Disability Management Employer Coalition estimates that employees who come to work with the flu increase lost workdays by 10 percent to 30 percent.

Read more at the Miami Herald.