beneficial bacteria

Researchers think genetically engineered versions of microbes that can live in humans could help treat some rare genetic disorders and perhaps help with Type 1 diabetes, cirrhosis and cancer.

Microbe-eating-microbes are found in "almost every ecosystem on Earth," says a defense department scientist who hopes bacteria of this type might one day be deployed to fight human infections.

Sales of probiotics are soaring. While some studies on this beneficial bacteria show it can treat specific health issues in children, scientists are exploring how it may help gut health more broadly.