Kali Hardig, 12, who is infected with a potentially deadly brain-eating parasite, is listed in critical condition, according to CNN.
The Arkansas Department of Health met with Willow Springs Water Park after the girl visited it. They think that was the source of her infection. Willow Springs closed on Friday.
Health officials say this amoeba is very rare, and that you're a thousand times more likely to die from drowning that you are to die from Naegleria.
The CDC recommends you not swim in freshwater when the water temperature is high and the water low. Also, use nose clips or hold your nose shut.