Add Yahoo as a preferred source to see more of our stories on Google. Naegleria fowleri, the "brain-eating amoeba" speeded up under a microscope.

The single-celled parasite Entamoeba histolytica infects 50 million people each year, killing nearly 70,000. Usually, this wily, shape-shifting amoeba causes nothing worse than diarrhea. But sometimes ...

Light microscope image and illustration of a Thecofilosea amoeba with intracellular Legionellales bacteria ('Ca. Pokemonas kadabra'). The bacteria were stained red by so-called 'fluorescence in situ ...