Board Thread:False Info and Speculative Discussion/@comment-1487677-20160206232829/@comment-1487677-20160207021336

Time to take you back to school paul.rea. Satomi explains in the episode weaponized, that " the disease progressed in her pack. It starts with fever followed by uncontrolled shifts including "full unwarranted transformations," trouble standing, and sudden blindness."

http://teenwolf.wikia.com/wiki/Weaponized

So they may have been killed by a virus but it still has the basic effects of wolfsbane. The part about full unwarranted transformations was seen twice in that episode. Not to mention if a dozen more "WEREWOLVES" were found victims to it, I doubt that none of them transformed when they died. Derek and Malia didn't say they moved the bodies (probably because they could have contracted it as well) so that leaves a dozen poisoned (and transformed werewolves) in the woods rotting without him doing much guarding of them.