Even When Just 20 Percent Effective, Flu Vaccine Saves Lives

GAINESVILLE, Fla. (CNN) – Each winter, many people wonder whether its worth getting a flu shot while health officials repeatedly warn against not getting one. Now, a new study sheds light on the benefit of doing so.
Even when the flu shot is just 20 percent effective, it can still reduce U.S. doctor visits due to illness by an estimated 20 million in a single year, the new report published in the scientific journal PNAS (Proceedings of the National Academy of Sciences of the United St