Something's gone rotten in the woods

The first teenager to fall ill is Karen, whom the others immediately quarantine by locking her in a shack. The disease eats its victims rapidly from inside out. Lesions are quickly followed by massive hemorrhaging. As one camper after another develops symptoms, the five friends panic and turn on each other. And because the acting is unusually solid, their desperate, each-man-for-himself behavior becomes a scary microcosm of mass hysteria and social chaos in the face of catastrophe.