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Valve has revealed another new campaign set to appear in Left 4 Dead 2 at San Diego Comic-Con. It's called "Swamp Fever," and, as the lovely lobby poster you can view in the gallery below states, "The Only Cure Is Dying." Harsh! It's packed with Mudmen, Spitters and all sorts of nastiness you'd expect from a zombie-filled swamp. We've spent some quality time trudging through the level on the convention floor and will have a full writeup on the bone-rattling experience soon.

This article was originally published on Joystiq.