The flu vaccine is generally most effective in young and healthy people under 65. But, this season, vaccine effectiveness has been highest at 26 percent in those aged 6 months to 17 years. The vaccine effectiveness was found to be just 12 percent for ages 18 to 49 years and 14 percent for people aged 50 years and older.
The Centers for Disease Control (CDC) and Prevention stated that the flu vaccine for 2014-2015 is not the worst ever. The effectiveness of the vaccine in the past decade has ranged from 10 percent to 60 percent. However, CDC has urged doctors to ramp up the use of antiviral medications in people who fall ill with influenza.
The CDC is still recommending people to get a flu shot because it may help prevent severe infections and complications that lead to hospitalization or even death.