That meant the ambulance had to take him to Northwestern Memorial Hospital, 10 miles away.

CNN: Chicago's record murder rate: Don't blame guns alone

"It raised awareness of the importance of getting vaccinated, " says Anita Chandra-Puri, a pediatrician at Chicago's Northwestern Memorial Hospital.

WSJ: Where Could The Next Outbreak Of Measles Be?

Trio Health manages an executive physical program at Chicago's Northwestern Memorial Hospital that opened in 2005 and sees more than 1, 000 patients annually.

FORBES: Are those deluxe executive exams worth it?

Northwestern Memorial Hospital is on "bypass, " which happens when it is beyond capacity because of an influx of patients, such as during flu season.

CNN: Flu picks up steam across the U.S.

Thomas Pasqualini, a 50-year-old supply-chain official at Solo Cup, says an executive physical at Northwestern Memorial Hospital in 2006 spurred him to fix his unhealthy lifestyle.

FORBES: Are those deluxe executive exams worth it?

Imerman continues to make his rounds at the oncology wings of Northwestern Memorial Hospital in Chicago, just like he did in Detroit more than a decade ago.

CNN: Pairing 'angels' with cancer patients

Dr. David Zich, internal medicine and emergency medicine physician at Northwestern Memorial Hospital in Chicago, said this is the worst flu season he's seen in his 12 years at his hospital, in terms of the concentration of patients.

CNN: Flu picks up steam across the U.S.