This year's flu vaccine may only be 10% effective, experts warn

Health officials say there are a number of signs pointing to a potentially rough flu season. According to the Centers for Disease Control and Prevention, more than 7,000 cases of influenza have been confirmed in the U.S. so far, which is more than double the number this time last year. Flu is currently widespread in four states, including Georgia, Oklahoma, Louisiana, and Massachusetts, the CDC reports.What's more, this year's flu shot may not be up to the task. It is the same formulation that w