Two severe cases of Vibrio vulnificus wound infection with secondary septicemia occurred during 1 week in August 2003 on the German island of Usedom in the southwestern Baltic Sea. In both cases, pre-existing wounds were inoculated by wading in contaminated sea water. One of the patients died from septic multiorgan failure. To the best of our knowledge, this is the first fatality due to a V. vulnificus infection to have occurred in Germany. Microbiological analysis revealed high concentrations of V. vulnificus in sea water along the coastline, following a period when water temperature exceeded 20 degrees C for more than 2 weeks.