What Causes Food Poisoning from Oysters
Oysters can carry bacteria, viruses, and toxins that lead to food poisoning. Common causes include Vibrio bacteria, norovirus, and hepatitis A. Contamination often occurs because oysters filter large volumes of seawater, concentrating pathogens. Eating raw or undercooked oysters raises the risk of illness.
Symptoms and Health Risks
Symptoms usually appear within hours to days after eating contaminated oysters and may include nausea, vomiting, diarrhea, abdominal cramps, and fever. In severe cases, Vibrio infections can lead to bloodstream infections or wound illness, especially in people with weakened immune systems. Seek medical care for high fever, dehydration, or persistent symptoms.
How to Reduce the Risk
Cook oysters thoroughly to reduce the chance of food poisoning. The U.S. Food and Drug Administration advises cooking until the shells open fully and the meat is firm. Avoid raw oysters if you have liver disease, diabetes, or a compromised immune system. Check local shellfish safety advisories and buy oysters from licensed, reputable sources.
