There were at least 3.7 million illnesses, 32,000 hospitalizations and 1,800 deaths in the U.S. from influenza during the 2019-20 season as of mid December, according to the Centers for Disease Control and Prevention's most recent FluView report.
All areas of the country are seeing elevated levels of flu-like illness. Nineteen states experienced high flu-like illness activity for the week ending Dec. 14.
The activity so far is mostly caused by influenza B/Victoria viruses, which is unusual for this time of year, the report said.
Thirty states reported widespread flu activity and 17 reported regional flu activity.