Three-quarters of people who got flu shot this year weren’t protected against most common strain
Why is this year's flu season so bad? In part, new data show, because the flu shot failed to protect three-quarters of people against most common strain.
Three-quarters of people who got a flu shot this year were not protected against H3N2 flu, the viruses that have caused the lion’s share of disease in what has been one of the most difficult flu seasons in years in the United States, according to new data from the Centers for Disease Control and Prevention.
While the vaccine was more effective against influenza B viruses (42 percent protection) and H1N1 viruses (67 percent protection), that is cold comfort given that those viruses have been much more minor players
