By Christopher Ingraham

In recent years, a number of studies have attempted to quantify the extent to which sick employees are making influenza outbreaks worse. In 2010, a policy brief published by the Institute for Women’s Policy Research used data from the CDC and the BLS to estimate that during the virulent 2009 flu season, about 8 million American workers went to work while infected with the influenza virus, causing an additional 7 million people to get sick in the process.

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