Bacteria called Orientia tsutsugamushi causes the disease scrub typhus, which is spread to people through bites of infected chiggers, according to the Centers for Disease Control and Prevention.
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Man, I hate chiggers. I've never had a problem with them here, but when I was a kid in Georgia, I'd come in from hunting and my legs would be infested with them from the knees down, itching and burning like my legs were on fire.