Facultative anaerobes, producing acid from the ferrmentation of a range of carbohydrates. Motile by means of a single polar, sheathed flagella. V cholerae serogroups O1 and O139 cause cholera in humans, while other vibrios may cause sepsis or enteritis.ĭefinition of Genus Vibrio Short, 2 × 0.5 µm, often curved Gram negative rods. They are curved aerobic rods and are motile, possessing a polar flagellum. The Vibrios Vibrios are among the most common bacteria in surface waters worldwide. Vibrio cholerae produces an enterotoxin that causes cholera, a profuse watery diarrhea that can rapidly lead to dehydration and death.

Aeromonas is found predominantly in fresh water and occasionally in cold blooded animals. Vibrios are found in marine and surface water. Vibrio and Aeromonas are now classified in the families Vibrionaceae and Aeromonadaceae, respectively. However, molecular biology techniques have established that these genera are only distantly related and belong in separate families:

These organisms were also classified together because they are primarily found in water and are able to cause gastrointestinal disease. These organisms were at one time classified together in the family Vibrionaceae and were separated from the Enterobacteriaceae on the basis of a positive oxidase reaction and the presence of polar flagella. Introduction The second major group of gram-negative, facultatively anaerobic, fermentative rods are the genera Vibrio and Aeromonas. ALPANA VERMA International Medical & Technological University, Tanzania.

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