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Shigella stool.jpg
Photomicrograph of Shigella sp. in a stool specimen
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Gamma Proteobacteria
Order: Enterobacteriales
Family: Enterobacteriaceae
Genus: Shigella
Castellani & Chalmers 1919

S. boydii
S. dysenteriae
S. flexneri
S. sonnei

Shigella is a genus of bacterium. It belongs to a small group of pathogens (including E. coli and Salmonella) that can infect the gut after the ingestion of relatively few organisms. The bacteria can cause sudden and severe diarrhea in humans.