Nicole Hancock November 18, 2016 Set 3 Detailed Shigella Nicole Hancock November 18, 2016 Set 3 Shigellosis is an acute intestinal illness caused by a group of bacteria called Shigellae. There are four species of Shigellae; Shigella sonnei (abbreviated S. sonnei or “Type D”), S. flexneri (or “Type B”), S. boydii and S. dysenteriae.