Following Grey's Anatomy Season 10 Episode 17, an installment centered around Cristina Yang, the rest of the hospital staff will be brought back into the fold next Thursday.

But for a very scary reason.

On Grey's Anatomy Season 10 Episode 18, the doctors each become ill due to the outbreak of a dangerous virus. Yes, even you Derek, despite claims that you never get sick.

This surgeon must fight off the sickness as he prepares to give a speech on brain mapping, while a new physician gives Alex a look into an alternate form of medical practice.

Watch the official teaser for "You Be Illin" now:

Remember, you can always watch Grey's Anatomy online in order to catch up and you can flip through photos from this upcoming installment now:

Grey's Anatomy Photos from "You'll Be Illin"

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Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.