(KCEN) -- This flu season is off to an early and strong start.
The Centers for Disease Control will update flu activity in the U.S. today.
Schools in Tennessee and Michigan even canceled classes because of widespread illness.
Experts say the last time they saw this many patients visiting doctors for the flu was in 2004.
Nearly every state has reported some flu activity.
CDC officials say it's still not too late to get a flu shot.