Vibrio septicemia, resulting in high mortality, has been caused by Vibrio vulnificus. Ingestion of marine products or contact with sea water contaminated with V. vulnificus can cause septicemia. V. vulnificus has been detected world wide and west sea area of Korea, Kum river estuary in particular, showed high detection rate. Higher detection rates of V. vulnificus were reported in the bottom deposit with low depth of water, low salinity, and high COD. Man with the liver disease can easily come down with Vibrio septicemia and the main source is the sliced raw fish dish. The preventive measure for this disease is to wash raw fish material thoroughly with tap water and handle in sanitary conditions. Washing with sea water is strictly prohibited. It may be necessary to forbid the small-scale businessmen from selling the sliced raw fish dish in the vicinity of seashore. Man with the liver disease or diabetes should not swim or consume the raw fish dish in the contaminated area during summer.