Our bodies are very good at fighting infections. The immune system reacts and attacks the bacteria and viruses that make us sick. But sometimes the immune reaction is so strong that it damages the body too. This is called a septic reaction, or sepsis. And the mortality rate associated with it can be high. Doctors at Mayo Clinic want to change that. They've organized a sepsis response team in the intensive care unit. Their goal: to stop sepsis and save lives.