Goes over my head tbh why wouldn't you vaccine. Like you have all the vaccines for tick bites that can make you pretty much brain dead and why would I turn this down? Happened to my friend, luckily found out in the early stage that he has it and doesn't have much damage from the tick, but he's still not quite the same and I'm sure vaccine would have made a huge difference.
Ticks can carry a variety of problematic pathogens, but the main one at this time is Borrelia Burgdorferi (aka, Lyme disease.)
There was a vaccine developed and marketed for protection against this bacteria but it was removed from the market rather quickly because it had devastating health effects on a lot of people. It was called 'LYMErix' if you wish to read about it.
The idea that ticks can be used to spread diseases to humans as a part of a biological warfare system dates back at least to the Nazi regime. At least one of the top scientists working on such systems were given U.S. citizenship after the war and worked at Plumb Island Animal Disease Center'. 'Animal'. Lol. That facility is right across from Lyme, Connecticut of 'Lyme disease' fame just for what it's worth.
https://en.wikipedia.org/wiki/Erich_TraubThe U.S. military, officers commissioned by said, and other employees hold various patents on a variety of microbes which have potential for use as biological warfare agents (often of the so-called non-lethal variety so they just make target populations chronically ill rather than kill them.) Also delivery systems/methods. The Rockefeller institute owns zika and many others though. Same Rockefeller clan who got their start selling 'snake oil' cures and who were highly interested population control and in eugenics. And who spent a lot of money funding medical schools as part of their 'philanthropy.'