A new study published by the Centers for Disease Control and Prevention (CDC) has detected primary amebic meningoencephalitis-causing amoeba Naegleria fowleri in several popular recreation areas across the Western United States, including Yellowstone National Park, Grand Teton National Park, and Lake Mead National Recreation Area. Researchers found the organism in 34% of water samples collected between 2016 and 2024.
Although infections remain extremely rare, the amoeba is highly dangerous. According to the CDC study, published on March 2, only four people survived out of 167 reported US cases between 1962 and 2024. Infection occurs when contaminated water enters the nose, often while swimming or diving in lakes, rivers, or hot springs.
Scientists warn the organism has been steadily spreading northward as global temperatures rise, prompting calls for stronger monitoring and public awareness campaigns.
In light of these findings, as temperatures rise and people flock to lakes and water parks, understanding the risks of Naegleria fowleri is becoming increasingly important. Click through this informative gallery to learn more about the deadly amoeba, its symptoms, and how to stay safe.