[voice over] When a virus finds its way into our bodies our immune system unleashes an attack. It puts up a good fight and then stands down. Or at least that's what it's supposed to do. Sometimes the system works so hard that it goes completely off the rails. Immune cells start attacking healthy tissue. They flood the lungs, clot the blood, cause vessels to leak, and shut down organs. Our own body wreaks havoc on itself. It's called the cytokine storm. And it takes a miracle to stop it.
More from this episode
More Grey's Anatomy quotes · These quotes come from Wikiquote's Grey's Anatomy pages and are available under the Creative Commons Attribution-ShareAlike License.