Shigella is a bacteria that in humans and other primates causes a form of food poisoning known as shigellosis. It is closely related to e. coli but is only naturally found in humans and gorillas. It is one of the leading causes of infectious diarrhea. Although figures are uncertain as the course of the disease is similar to many others, it causes somewhere between 70,000 and 600,000 deaths each year.
Shigella is very virulent and even 100 bacteria can cause infection even in a healthy individual. It inhabits the cells of the large intestine causing inflammation. In some cases, it also releases a toxin which can lead to hemolytic uremic syndrome.