Since this (EHD) is caused by insect bites, I would think the only way it is possible for that to be the cause is if a large swarm of insects came over the elk and just had an open buffet. Especially since they all died together apparently. If that happened, which is obviously a very rare incidence, then Im a little worried about this swarm that's still out there ready to knock out some more herds of whatever. But, the fact that the disease usually takes hours to kill, and is not always deadly according to the story, makes me think when they were going through it they would have spread out (like I have heard these animals do when they actually have EHD also). Just some thoughts, but I too smell fish, some testing should clear this up sooner than later hopefully.