A patient develops septicemia and hemorrhagic bullous skin lesions after eating raw oysters. Which organism is most likely responsible?

• A. Aeromonas hydrophila
• B. Plesiomonas shigelloides
• C. Vibrio vulnificus
• D. Yersinia enterocolitica

Answer: (C)

When raw seafood is involved, a fast, life-threatening sepsis with skin bullae points to a marine Vibrio. Vibrio vulnificus is notorious for causing severe septicemia after ingesting contaminated seafood like oysters, and it can produce hemorrhagic bullous skin lesions as the infection progresses. It tends to affect people with underlying liver disease or iron overload, making the illness particularly dangerous in those patients. This combination of oyster exposure, rapid septicemia, and hemorrhagic bullae is the hallmark that distinguishes it from other water-associated pathogens.

Other organisms from aquatic environments can cause gastroenteritis or wound infections, but they don’t fit this pattern as well. Aeromonas hydrophila and Plesiomonas shigelloides can be linked to water exposure and cause GI symptoms or wounds, but they’re not as characteristically associated with raw oysters and fulminant septicemia with bullous skin lesions. Yersinia enterocolitica centers on enteritis and mesenteric symptoms rather than oyster-related septicemia with skin bullae.