This is something I have to put up with where I hunt year round including rattlesnakes(I've seen it in the high 90's during mid December). I wouldn't worry too much about it though. It's the same as worrying you might step on a mesquite thorn and get hospitalized with a joint infection(happened to someone I know). We are all aware of the inherent risks when entering the woods; I just count that as one of them. Besides, from what I know, the ticks must be attached to you for approx. 24 hours before you can contract the disease. Therefore, if you just make sure to check yourself at the end of the day, you should be fine.