If I am correct, the disease or infection is caused from agnat or a fly bite. It causes severe swelling in the neck and around the hoofs. Often when found, the deer will have large splits or lacerations around their hoofs, and sometimes around their hocks. There is swelling in and around the throat, causeing the tounge to swell and turn color, hince the Blue Tounge, the deer are often found near a water source. Have not been able to get in touch with our local biologist at Crab Orchard Refuge. This happened here a few years ago. Usually as mentioned earlier when it is hot and dry,