Influenza A H3N2 subclade K has driven flu cases across the country, with 52 counties in Florida seeing increases over the past week. While the current flu vaccine might be a "mismatch," it still ...

Add Yahoo as a preferred source to see more of our stories on Google. The flu season is ramping up in a big way as an influenza A H3N2 mutation called subclade K drove a near 15% increase in clinical ...

Sickness is surging across the United States following the holiday season, bringing thermometers and medicine to homes amid presents and Christmas dinner leftovers. New York state especially has been ...

NEW YORK (AP) — As the U.S. flu season winds down, health officials say the flu vaccine didn't work very well, with one of its worst effectiveness rates in more than a decade. A new strain that ...

NEW YORK (AP) — As the U.S. flu season winds down, health officials say the flu vaccine didn’t work very well, with one of its worst effectiveness rates in more than a decade. A new strain that ...