Which episode of X Files has the disease where the person's neck explodes.?!

There is an episode where Scully is trapped with a bunch of people who have an airborne disease where the person goes into a seizure then the top of their spine bursts through the front of their necks!. Its a horribly grotesque scene which nobody seems to remember!. In the episode Scully is handcuffed to one of the infected people, and she escapes narrowly by putting the person in the next room, then hiding around the door!.Www@Enter-QA@Com

---

---