"You Be Illin"
The hospital gets inundated with flu infected patients, which causes the doctors to slowly fall ill one by one. Derek must fight off the sickness as he prepares to give a speech on brain mapping and the residents place bets on who will fall ill first. Meanwhile, a new doctor at the hospital gives Alex a glimpse into an alternate form of medical practice.
Image from Grey's Anatomy Episode 1018: "You Be Illin'" which originally aired Thursday, April 3 at 9|8c.