Tics, in the grass & bushes, wait for a warm blooded creature to walk by, and they drop on you. they are very small and hard to spot. Best thing to do, after a walk in the woods, is put all yr clothes in the washing machine & have a shower, feeling all over, for something that should not be there. It takes 24 hrs from finding a spot, like an armpit or between the legs, for the tick to start sucking blood. Then the tiny lil thing, will swell to the size of a large pea, or even small baked bean. If it gets to that size, before you discover it, then yes, you should be checked for lyme disease, because it has had time to infect you. Yes some people say just spray your trouser legs & shoes with OFF or similar products,but as said tics can drop from tree branches and small bushes, so you would have to cover all your clothes and skin with some sort of repellent, for that to be effective. In the Army, we used to do a buddy buddy tick search, every 24 hrs,or near as possible, while on exercise, to get the ticks before they can infect you.......Ok its Supposedly Only 1 in 4 that carry the Lyme disease, but who wants to risk what amounts to a 6 month Influenza type illness, with lasting effects !!