http://www.cdc.gov/ncidod/dbmd/diseaseinfo/vibriovulnificus_g.htmPersons who are immunocompromised, especially those with chronic liver disease, are at risk for V. vulnificus when they eat raw seafood, particularly oysters. A recent study showed that people with these pre-existing medical conditions were 80 times more likely to develop V. vulnificus bloodstream infections than were healthy people. The bacterium is frequently isolated from oysters and other shellfish in warm coastal waters during the summer months. Since it is naturally found in warm marine waters, people with open wounds can be exposed to V. vulnificus through direct contact with seawater. There is no evidence for person-to-person transmission of V. vulnificus.
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Some tips for preventing V. vulnificus infections, particularly among immunocompromised patients, including those with underlying liver disease:
Do not eat raw oysters or other raw shellfish.
Cook shellfish (oysters, clams, mussels) thoroughly:
For shellfish in the shell, either a) boil until the shells open and continue boiling for 5 more minutes, or b) steam until the shells open and then continue cooking for 9 more minutes. Do not eat those shellfish that do not open during cooking. Boil shucked oysters at least 3 minutes, or fry them in oil at least 10 minutes at 375°F.
Avoid cross-contamination of cooked seafood and other foods with raw seafood and juices from raw seafood.
Eat shellfish promptly after cooking and refrigerate leftovers.
Avoid exposure of open wounds or broken skin to warm salt or brackish water, or to raw shellfish harvested from such waters.
Wear protective clothing (e.g., gloves) when handling raw shellfish.