From what Ive read, and heard, its EHD(blue tongue) I think its caused by gnats and flies carrying the virus, and it spreads badly in drought conditions, because of large numbers of deer watering in close quarters. Very litte water, and lots of deer are drinking at the same small water hole, and it can spread quickly. They say that rainy and colder weather should clear it up. I went to scout a new farm yesterday, and the farmer said he has found 5 dead bucks on his place, and all in or near water, he's pretty fearful for his cattle.