OutsideMay 6, 2026Deadly Brain-Eating Amoeba Detected in Yellowstone, Grand Teton, and Lake MeadA 2026 study confirms Naegleria fowleri in popular national park hot springs and lakes. Here is what soakers need to know to stay safe.12 sights in this storyGrand TetonSightA visit to this northwestern Wyoming park, which is as thrilling for wildlife watchers as it is for climbers, hikers,…Polecate Hot SpringsSightContained highest concentration of N. fowleri.Boiling RiverSightHydrothermal water mixes with river, amoeba detected.Lewis LakeSightMultiple springs on southern shore tested positive.Lake Mead Recreation AreaSightHuckleberry Hot SpringsSightGranite Hot SpringsSightGoose LakeSightFirehole Canyon Swimming AreaSightRoger's Hot SpringsSightBoy ScoutSightBlue PointSightRead the full piece at Outside →