[crz]

Being formerly from the upper midwest, I thought I was immune from Lyme. I got it last year.

[verum ago]

Being formerly from the upper midwest, I thought I was immune from Lyme. I got it last year.

That reminds me of something: I know a girl who thought she was immune to poison ivy. She plowed through a bunch in shorts and sandals and nothing happened. She didn't realize that no one gets a reaction on the first time: you have to be sensitized first (and everyone does get sensitized eventually). So about a month later she again plowed through knee-high poison ivy for nearly an hour. Worst case I've ever seen by a huge margin.

Never assume you're immune to something just because you haven't gotten it before. It may be that you just haven't gotten it yet...