Have the flu or know someone with it? Flu cases surge to highest levels in 15 years, CDC says
Influenza levels in the US are the highest they've been in 15 years amid winter weather and a second wave of the virus.
Flu activity now highest in 15 years: See which states have it worst
Influenza cases continue to mount with the virus reaching activity levels in the U.S. not seen for the last 15 years, ...