Be OFFENSIVE and DEFENSIVE, go after them before they get your deer, fog the ponds close by. Last year I lost 50 in a week and a half and the day I got my guardian fogger and fogged around the pond that is 60 yards from my pen, I never had another SINGLE DEER get sick. Don't wait for the bug to get into your pen and hope you kill him before it bites your deer, go after them. I really believe they don't travel too far from the mud and they probably go back to it during the heat of the day. This year the one weekend I didn't fog while I was out of town and it was 100 degrees for about 4 days, they must have hatched, I had 3 sick deer a day after I got back, Im assuming they hatched out the days I was gone. Anyhow, fogging is back on track and all the deer are doing well so far. By the way, Last year they tested positive for EHD and this year the one I had tested showed up to be blue tongue virus. I'm in central SD and just talked to a guy in western SD who found 8 wild deer dead yesterday. On another note, This year I have fogged all of my stock ponds on my farm which is 20 miles away, 8 total and an 800 acre mud slough, last year I found more dead wild deer then I could count, this year I've found 2 so far and they died BEFORE I started fogging, we get it in the wild EVERY YEAR, some years hundreds and others just a couple. The fogger isn't full proof but there is NO doubt, it helps. I can fog all the way around the 800 acre slough with about 2 gallons of permonone ($80 worth). I do it about 2 times a week, cheap investment if it saves some deer.