New Flu Shot Addresses Last Year's Shortcomings

This season's flu vaccine will contain the strain of influenza virus that was predominant during last year's worse-than-usual flu season, according to the Centers for Disease Control and Prevention (CDC). Last season, a particular strain of H3N2 flu virus — known as the "Switzerland variant" — circulated widely and was poorly matched to the H3N2 strain found in the vaccine, Dr. Tom Frieden, director of the CDC, said at a news conference today (Sept. 17). Last year was a bad year for