- Natural reservoirs are fresh water and fish in temperate and tropical regions.
- Infections usually are associated with travel to tropical areas or consumption of raw seafood.
Plesiomonas shigelloides, a ubiquitous freshwater inhabitant, has been implicated as a cause of acute diarrhea and, rarely, serious extraintestinal disease.
The name Plesiomonas, from the Greek word for “neighbor,” was chosen because the organism was believed to be closely related to Aeromonas. It is, in fact, more closely related to Proteus, although it is currently classified in the Vibrionaceae.
P. shigelloides is the only species in the genus. The organism was originally isolated in 1947 and given the name C27. It has also been named Pseudomonas shigelloides, Aeromonas shigelloides, and Fergusonia shigelloides.
- Mainstay is replacement of fluid and electrolyte losses, preferably by oral rehydration.
- Antimicrobial therapy is recommended for extraintestinal infections and for acute gastroenteritis in children with underlying conditions.
- Most strains produce β-lactamase, but they are susceptible to cephalosporins, amoxicillin-clavulanate, carbapenems, and fluoroquinolones.
- Recommended empiric antibiotic therapy usually is a third-generation cephalosporin.
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