Up in New Hampshire we are worrying about several variations of Lyme disease and West Nile virus.  But some of these other, more exotic things are being found as well, and I can't decide whether most of them were around already and we are just discovering that fact, or, new stuff is coming in from abroad and from mutations of everything.  It is probably a combination and is worthy of trying one's best to keep current.  We are trying numerous ploys to avoid Tick bites but when one latched on to me last June I went to the local USAF hospital and they immediately put me on mega-antibiotics - just in case.  Tests for Lyme are several, expensive, and fraught with both negative and positive false results.  And no, you don't "develop an immunity" to the Spirochetes for Lyme either.  Best advice is to seek the Ticks at every opportunity, remove them before they have had a chance to burrow in for more than a few hours.  My hunting and woods-use procedures now involve good lights and several mirrors - always.  :(