flu shot

This year's flu shot is less than 50% effective, CDC says

Don't let your guard down: The US flu season is expected to continue for several more weeks, with activity across the nation now elevated, the US Centers for Disease Control and Prevention reported Thursday. A flu shot is still recommended for those who have neglected to get one, but the CDC estimated this year's vaccine's overall effectiveness in preventing an infection at just 47%.

Flu vaccine just 36% effective this season, CDC reports

Flu season is still raging in the United States, yet already it ranks among the most difficult in recent years. One reason: This year's vaccine has been just 36 percent effective against both A and B virus strains, the U.S. Centers for Disease Control and Prevention estimated in Thursday's Morbidity and Mortality Weekly Report.