These maps from the CDC show how widespread the flu is at the beginning of 2020 and how it compares to the same period in 2019 and 2018:
Weekly Influenza Activity Estimates Reported by State and Territorial Epidemiologists (CDC)Weekly Influenza Activity Estimates Reported by State and Territorial Epidemiologists (CDC)A Weekly Influenza Surveillance Report Prepared by the Influenza Division (CDC)
Flu symptoms (from the CDC)
Influenza (flu) can cause mild to severe illness, and at times can lead to death. Flu is different from a cold. Flu usually comes on suddenly. People who have flu often feel some or all of these symptoms:
fever* or feeling feverish/chills
cough
sore throat
runny or stuffy nose
muscle or body aches
headaches
fatigue (tiredness)
some people may have vomiting and diarrhea, though this is more common in children than adults.
*It’s important to note that not everyone with flu will have a fever.