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Aeromonas is a Gram-negative, facultative anaerobic, rod-shaped bacterium that morphologically resembles members of the family Enterobacteriaceae. Most of the 14 described species have been associated with human diseases. The most important pathogens are A. hydrophila, A. caviae, and A. veronii biovar sobria. The organisms are ubiquitous in fresh and brackish water. 
They group with the gamma subclass of the Proteobacteria.
Two major diseases associated with Aeromonas are gastroenteritis and wound infections, with or without bacteremia. Gastroenteritis typically occurs after the ingestion of contaminated water or food, whereas wound infections result from exposure to contaminated water.
- opportunistic systemic disease in immunocompromised patients
- diarrheal disease in otherwise healthy individuals
- wound infections
Caution about differential diagnosis
If automated machines are not using the most updated database, Elizabethkingia meningoseptica may be mistaken for Aeromonas salmonicida.
Gastrointestinal disease in children is usually an acute, severe illness, whereas that in adults tends to be chronic diarrhea. Severe Aeromonas gastroenteritis resembles shigellosis, with blood and leukocytes in the stool. Acute diarrheal disease is self-limited, and only supportive care is indicated in affected patients.
Aeromonas species are resistant to penicillins, most cephalosporins, and erythromycin. Ciprofloxacin is consistently active against their strains in the U.S. and Europe, but resistant cases have been reported in Asia.
Members of the genus Aeromonas can be referred to as aeromonads (viz. trivialisation of names).
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