A Texas woman died after using RV tap water to rinse her sinuses, and health officials say a rare brain-eating amoeba was to blame. The CDC is now warning people to avoid using untreated water for nasal rinsing.

A healthy Texas woman, 71, died from Naegleria fowleri, or brain-eating amoeba, after using a nasal irrigation device with tap water. Health officials warn that rinsing sinuses or nasal passages should only be done with sterile water.