NCIt definition : A species of facultatively anaerobic, Gram negative, rod shaped bacteria in the phylum
Proteobacteria. This species is indole and citrate negative, ferments mannitol and
ornithine and is beta-D-galactosidase positive. S. sonnei is found in the human gastrointestinal
system and is pathogenic, being a causative agent of shigellosis.;
Alternative definition : CDISC: Any bacterial organism that can be assigned to the species Shigella sonnei.;