I have seen them as heavy as they are this year on many Deer in my area and when the fall gets here only a few seem to be the worse because of them. The healthy ones seem to suffer no adverse affects at all based on the health I see during the hunting season. I keep my cameras up all summer and up to the end of the season so I have a good idea how the herd is doing in my area. The are tough animals and I put out mineral blocks with sulphur to help them out and some of the supliments helps I believe as well. Even after the drought last year they bounced back in our area.