So a little unscientific study: Have you had the flu? How many people that you know have had it? Have you taken the flu shot? What do you feel about the flu shot? Numerous Chicago hospitals' ERs are so swamped that they are actually turning away ambulances with patients.

From a Yahoo article:

Since September, the CDC has reported more than 22,000 (emphasis added) cases of flu, compared to just 849 cases in the same period a year ago. The surge of infections has prompted Boston to declare a public health emergency, and a Pennsylvania hospital was so swamped that it had to put up a tent to handle flu patients.