Hospitals around the world Thursday are focusing on an enormous problem for their sickest patients. A Charlotte hospital is among the more than 1,400 taking part in a one-day study of the life-threatening illness called sepsis.

Sepsis is basically your body overreacting to an infection, and it can lead to organ failure and death.

Dr. Alan Heffner leads Carolinas HealthCare System's campaign against it and works at the flagship hospital, CMC-Main.