Plesiomonas shigelloides

RANK: Species

TAXONOMY: Bacteria -> Proteobacteria -> Gammaproteobacteria -> Enterobacteriales -> Enterobacteriaceae -> Plesiomonas -> Plesiomonas shigelloides


Plesiomonas shigelloides is a species of bacteria that was formerly classified in the family Vibrionaceae, but now most microbiologists agree that a better classification is in the family Enterobacteriaceae (see box on the right). It is a Gram-negative, rod-shaped bacterium which has been isolated from freshwater, freshwater fish, and shellfish and from many types of animals including humas, cattle, goats, swine, cats, dogs, monkeys, vultures, snakes, and toads. P. shigelloides has been isolated from a wide variety of human clinical specimens including both intestinal and extra-intestinal. It has been isolated from the feces of humans, both with and without diarrhea, and or vomiting (gastroenteritis). Many literature reports state or imply that P. shigelloides can cause diarrhea/gastroenteritis in humans. However, isolation from the feces of a case with diarrhea should not lead to the conclusion that the strain of P. shigelloides is actually causing the diarrhea in the case; i.e. association does not prove causation. P. shigelloides has been isolated from a wide variety of human extra-intestinal clinical specimens, often from those with an immune deficiency.

This species has been identified as a resident in the human gastrointestinal tract based on the phylogenetic framework of its small subunit ribosomal RNA gene sequences.[PMC 4262072]

Gut associated
Substrates/ Growth Factors
  • L-Tryptophan

  • Metabolic Endproducts
  • Indole