As a food safety expert with a focus on seafood, I can provide you with a comprehensive understanding of what can happen when you consume a bad oyster, and the potential health risks associated with it. Eating a bad oyster can lead to a range of health issues primarily due to the presence of harmful bacteria, viruses, or parasites that may not be killed by the human stomach's acidity. One of the most notorious bacteria associated with oyster-related illnesses is Vibrio vulnificus, a naturally occurring bacterium found in warm seawater. When ingested, Vibrio vulnificus can cause a serious infection known as vibriosis. The symptoms of vibriosis typically manifest within a day or two after consumption and can include: 1. Abdominal pain - This can range from mild discomfort to severe cramps. 2. Vomiting - This is often an early sign of food poisoning. 3. Diarrhea - This can be watery or bloody in severe cases. 4. Chills - The body's response to an infection. 5. Fever - An elevated body temperature as part of the immune system's defense mechanism. 6. Skin lesions - These can occur in some cases, particularly if the infection is severe. In addition to vibriosis, consuming contaminated oysters can also lead to other illnesses such as norovirus, which is highly contagious and can cause symptoms like diarrhea, vomiting, and stomach pain. There's also the risk of parasites like hepatitis A, which can lead to more serious liver conditions. It's important to note that not all oysters are harmful, and when properly cooked, the risk of illness is significantly reduced. Cooking oysters to an internal temperature of at least 145 degrees Fahrenheit (63 degrees Celsius) for at least 10 seconds is generally considered safe. If you suspect you've consumed a bad oyster and are experiencing symptoms, it's crucial to contact your physician immediately. Early diagnosis and treatment can prevent the condition from worsening and can help manage the symptoms effectively. To minimize the risk of illness from oysters, it's advisable to: - Purchase oysters from reputable sources. - Ensure they are properly stored until cooking. - Cook oysters thoroughly before consumption. - Be cautious with raw oyster consumption, especially if you have a weakened immune system. In summary, while oysters can be a delicious and nutritious food, they can also pose serious health risks if they are contaminated. It's essential to handle and consume them with care to avoid foodborne illnesses. read more >>

Eating raw or undercooked shellfish, like oysters, can be dangerous -- even if the oyster is fresh and healthy. ... If you become sick within a few days of consuming raw or undercooked oysters, contact your physician. Symptoms of a Vibrio infection include abdominal pain, vomiting, diarrhea, chills, fever and skin lesions.read more >>