<unk>  is a species of the rod-shaped bacterial genus<unk> .[page needed]<unk>  species can cause<unk> sis (bacillary dysentery).<unk> e are Gram-negative, nonspore-forming, facultatively anaerobic, nonmotile bacteria.
S.<unk> , spread by contaminated water and food, causes the most severe dysentery because of its potent and deadly Shiga toxin, but other species may also be dysentery agents. Contamination is often caused by bacteria on unwashed hands during food preparation, or soiled hands reaching the mouth.[citation needed]
Shigella dysenteriae
Salmonella enterica
Salmonella enteritidis
Clostridium difficile
Salmonella bongori
Salmonella
Vibrio cholerae
Yersinia enterocolitica