I had some ticks back in February and early March. Mosquito Biologist I know says ticks are amazing (minor chord music) as they basically wait in brush / weeds / high grass near active areas (road sides are a favorite haunt - drawn to heat and vibration). They go on "standby" until they detect either motion (vibration) or heat (as in me or you or the critter of choice) and start waving their arms and legs until contact is made. If they get no contact, they can go back on standby! And they can wait for about a year! when it gets cold, they seek a crack in the bark or other shelter (but are available for birthdays and Bar Mizpahs).
I had Lymrix shots back in the early '90s. They were touted to immunize you, but as it turns out, nobody knows if they do or not. many side effects were noted and they discontinued dispensing them. (Funny note - now it turns out if tested you get a false positive so they have a harder time seeing if you have it, or just test like you do!)
You really should use preventive measures like products with a high concentration of DEET. also treat your clothing (and truck or mode of transportation) with a product like "Permonone", which when sprayed on gives you about 2 weeks of wash and wear! (Just don't spray your skin!)