Your Top 3 Flu Questions Answered

January 5, 2015 3:41 PM

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Your Top 3 Flu Questions Answered

This year’s vaccine is only 33 percent effective in preventing the flu because the virus started to “drift” and mutate after the vaccine was already manufactured, Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, told ABC News.

“The one thing about the flu that you can be sure, it’s really unpredictable,” Fauci said.

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