If a summertime trip to the shore always includes a stop at a raw oyster bar, consume with caution: Vibrio parahaemolyticus and Vibrio vulnificus can both can be contracted by eating raw shellfish, especially oysters. In fact, the CDC reported a 52% increase in Vibrio poisonings between 2011 and 2013.
Both of these bacteria cause diarrhea, vomiting, and abdominal pain in healthy people. For people with liver disease, diabetes, cancer, stomach disorders, or any other condition that affects the immune system, Vibrio vulnificus is extremely dangerous: it can invade the bloodstream, causing a life-threatening illness. Half of all Vibrio vulnificus bloodstream infections are fatal.