Flu season is in full swing across the U.S.
The Centers for Disease Control and Prevention reported a sharp increase of influenza activity last week.
It said 49 states and Puerto Rico reported widespread or regional flu activity.
It was widespread in 36 states.
The CDC also says 12 children have died from the flu this season and more than 2,400 people have been hospitalized.
Experts believe the flu virus is spread when a sick person talks, sneezes or coughs.
Common symptoms include fever, chills, cough, sore throat, headaches and fatigue.
Despite these painful symptoms, most people will recover in less than two weeks.