I have had Lymes and don't want it again. I cover myself in insect repellant - smidge, wash in insecticidal shampoo, spray permethrin on my stalking gear. But back from a couple of days up in the big woods of the far north and so far have removed six of the little *******s from me. They are tiny - less than 1 mm.
save using NBC kit, or not going up into the hills, and restricting my leisure time to concrete environments what can you do to prevent picking them up.