Due to a variety of factors, including deer overpopulation(1), the Lyme disease infection rate in Deer Ticks in New England is ridiculously high. While I was undergoing treatment for the 3rd time, my doctor indicated that probably 25% of ticks in that region carry the disease.
I'd be all for a vaccine. It would be even better if we could vaccinate the deer agains being hosts somehow...maybe in a salt lick?
(1) http://www.ct.gov/caes/lib/caes/documents/publications/fact_...