An eight-year-old Louisiana girl identified as Lillian Smart has died after contracting a suspected infection caused by Naegleria fowleri, commonly known as a brain-eating amoeba, authorities confirmed. The infection has been linked to a recent lake swim, though health officials have not publicly named the specific body of water involved.

Naegleria fowleri is a microscopic organism found in warm freshwater lakes, rivers, and hot springs. It enters the body through the nose and travels to the brain, where it causes primary amebic meningoencephalitis, a devastating infection that is fatal in more than 97 percent of cases. Symptoms typically begin within one to twelve days of exposure and progress rapidly from headache and fever to seizures and coma.

The infection is extraordinarily rare in the United States, with only a handful of cases reported each year, but cases tend to cluster in Southern states during summer months when water temperatures are highest. Louisiana has historically been among the states reporting cases most frequently.

Public health officials have urged swimmers to take precautions when entering warm freshwater, including avoiding submerging the head, using nose clips, and refraining from stirring up sediment in shallow areas where the amoeba is more likely to be concentrated. There is no widely effective treatment, though some patients have survived with aggressive experimental drug regimens.

The death has drawn renewed attention to the dangers of warm freshwater recreation as summer temperatures remain elevated across the Gulf Coast region. Health authorities are expected to continue investigating the circumstances of the exposure.