Researchers warn that free-living amoebas, microscopic organisms thriving in soil and water, are spreading globally due to climate change and ageing water systems. These pose serious health risks.

Primary amoebic meningoencephalitis (PAM) is caused most often by Naegleria fowleri, sometimes called the “brain-eating amoeba”. N. fowleri lives in warm freshwater, including lakes, hot springs, and ...