Rebecca is nearly run over by a pickup truck full of Afghan National Army soldiers heading for the hospital. Their leader -- who turns out to be an American Special Forces operative -- carries in one of his men, delirious with a serious infection, one that neither Rebecca nor Bobby have encountered before. When another patient comes down with the same bacterial infection, it becomes evident that the team is dealing with a highly contagious and antibiotic-resistant strain. They have no idea what it is, where it came from, or how to stop it from spreading as their patients continue to deteriorate. Colonel Marks is left with no choice but to quarantine the OR, ICU and the recovery room - the Role 3 medics are forced to do surgery in the dining hall. If they don't get it under control fast they won't be able to treat the incoming wounded. Meanwhile, Rebecca accompanies Pedersen off base to the Women's Clinic where they find a local in dire need of emergency life-saving surgery.