Colorado's flu season is underway

"Holiday season is flu season," said Dr. Neil Cella, a pediatric ER physician.

Cella, who works at HCA HealthONE Rocky Mountain Children's at Presbyterian St. Luke's in Denver said the hospital is busy treating flu patients ranging from babies to teenagers.

Watch the CBS News Colorado story

Learn more about the pediatric ER at HCA HealthONE Rocky Mountain Children's