We had it in Northern KY a couple of years ago. You need drought conditions. The midges die if they get hit by rain. The drought brings the deer to shrinking watering holes. The midges bite and transmit the EHD. EHD is kind of like deer influenza. The EHD causes a fever that causes the deer to seek out water. They go to the watering holes. The midges are there. Lather, Rinse, Repeat. If there's no drought, there probably won't be much in the way of EHD. The slightest bit of rain drowns the midges, and the cycle breaks down.
When we had it, my end of the county did not have any mortality. However, 5 miles away there was a nasty smell rising from a section of road that spoke of a massive die-off close by. I gather this can be a very hit-and-miss sort of thing.
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