vibrio vulnificus is a form of bacteria that can make people ill, as when eating bad clams or oysters, and more in people with a liver disease. "vibrio vulnificus" is a species of gram-negative, motile, curved rod-shaped (bacillus), pathogenic bacteria of the genus "vibrio". present in marine environments such as estuaries, brackish ponds, or coastal areas, "v. vulnificus" is related to 'v. cholerae', as a bacteria which can give people cholera.