I’m trying to figure out a front I’m working on for my current DW game.

I’m trying to figure out a front I’m working on for my current DW game. The concept is a plague, without getting into too much detail with the background on it, how would you create a disease vector as a front?

Further info: the disease is called The Hex Plague and it was created from a bit of magic-eating monster. When infected folks change, distort, and become twisted versions of themselves, tending to attack those nearby to spread the disease.

I can see the infected being a sort-of Horde as their own danger, spreading the disease, but what about the plague itself? How would I classify it?

Thank you for any forthcoming help.