Vibrio bacteria have closed three commercial growing areas and caused 30 confirmed illnesses in Washington this summer, according to the state Department of Health. Totten Inlet near Olympia, North Bay and Dabob Bay in north Hood Canal are closed for the rest of the summer due to these bacteria, which are common in warm weather conditions. Once water temperatures begin to cool in October, these growing areas will reopen.
People get vibriosis from eating raw or undercooked oysters that have Vibrio parahaemolyticus bacteria in them. Cooking shellfish until the shells just open is not enough to kill Vibrio bacteria. Shellfish should be cooked to an internal temperature of 145 degrees F for at least 15 seconds. Don’t rinse cooked oysters in seawater, which can re-contaminate them.
Vibriosis symptoms include diarrhea, stomach cramps, nausea, vomiting, headache, fever, and chills. Symptoms usually appear 12-24 hours after eating infected shellfish, and can last two to seven days. Vibriosis can be life-threatening for people with low immunity or chronic liver disease. Also at greater risk are people who take antacids, heart or diabetes medication, or who’ve had antibiotic or cancer treatments recently.
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