The agency says cases of flu among young adults and college students are on the rise.
Experts anticipate low vaccine rates could lead to an increase of the flu this winter.
The CDC is warning doctors to be on the lookout for cases and encouraging them to offer the vaccine to anyone who is eligible.
Flu vaccines are available to anyone 6 months of age or older.
VIDEO: Is it COVID, a cold or the flu? Here are a few easy ways to tell