More than 24 million people have had seasonal flu this season, according to estimates from the Centers for Disease Control and Prevention.

Flu cases are surging this winter—this season is no joke. New data from the Centers for Disease Control and Prevention suggests that this flu season is one of the hardest-hitting seen in more than a decade.

There have been at least 24 million illnesses, 310,000 hospitalizations and 13,000 deaths from flu so far this season, according to the CDC. The agency said in its weekly flu surveillance report that seasonal influenza activity continues to increase across the country.