| Shigella | A gram-negative flagellated bacteria of the Eschericiae group, responsible for dysentery in humans. Infection by drinking contaminated water is common. (27 Sep 1997) |
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| shigella boydii | One of the shigella species that produces bacillary dysentery (dysentery, bacillary). (12 Dec 1998) |
| shigella dysenteriae | A species of gram-negative, facultatively anaerobic, rod-shaped bacteria that is extremely pathogenic and causes severe dysentery. Infection with this organism often leads to ulceration of the intestinal epithelium. (12 Dec 1998) |
| shigella flexneri | A bacterium which is one of the aetiologic agents of bacillary dysentery (dysentery, bacillary) and sometimes of infantile gastroenteritis. (12 Dec 1998) |
| shigella sonnei | A lactose-fermenting bacterium causing dysentery. (12 Dec 1998) |