Turns out, it doesn't kill absolutely everybody it infects. A 12-year-old girl in Arkansas is recovering from her battle with the killer single-celled organism. She's the third known person to survive. Nobody knows yet how she, or the other survivors, made it through. Why? Well, that's more (sort of) good news. There've only been 130 recorded cases of brain-eating amoeba infection since 1962. It's so rare, that it's difficult for doctors to study.