They don’t like heat? That seems incorrect. If true, Then why are they a huge problem in TX and other southerly areas, and are only now spreading north?

Norway is projected to have growth in ticks and new tick species because of climate change (warmer and more humid climate), so that's one example of it moving north (though ticks seem to always have been in Norway?)

> Ticks are a problem regardless.

Ticks in my part of the world were never such a large problem. It was rare that you'd get one on your leg in the field behind our house, and now, you literally can't walk through the grass each year without having 10+ on your legs in a matter of minutes. Warmer and wetter weather and fewer hard winters. The presence of Lyme disease has also increased in them.

I have direct experience of this, so downvote all you want, climate change deniers.

AFAIK there was a Lyme disease vaccine, but was discontinued, probably because it wasn't effective enough, I don't remember the details.

So there's no natural immunity after having it once? How would a vaccine work then?

I don't understand why we're not vaccinating deer populations, even if we're not vaccinating humans out of safety concerns, etc.

That and deer populations need to be significantly culled (along with rodents, the other part of the Lyme / deer tick population cycle).

In any case, lack of long consistent extended cold spells in the winter to set back their breeding population is the reason they've moving further north. Which is tied directly to climate change.