Scientists are sounding the alarm on tough-to-kill amoebae that can spread disease, survive water treatment, and may become more common as the planet warms. Credit: Shutterstock Environmental and public health researchers are warning that a little-known group of microbes could become a much bigger threat to human health. These organisms, known as free living amoebae, are found in water and soil, but scientists say some species are becoming increasingly concerning as the world warms and water