There's something about ticks that drives even the most well-balanced among us a bit nutty. They're too small to feel when they're crawling on your skin. They pack their own anesthetic, so you don't realize they're burying their heads in your body. And they suck your blood for hours at a stretch. Besides grossing you out, ticks may carry certain bacteria that can make you very, very sick, as thousands of folks in the Northeast and Midwest who have developed Lyme disease can tell you.
But Lyme disease isn't the only or even the deadliest tick-borne infection. Ever since 1986, when...