Causes of Food Poisoning
Each year, millions of people in the United States get sick from contaminated food. Symptoms of food poisoning include upset stomach, abdominal cramps, nausea and vomiting, diarrhea, fever, and dehydration. Symptoms may range from mild to severe.
Bacteria and viruses are the most common cause of food poisoning. The symptoms and severity of food poisoning vary, depending on which bacteria or virus has contaminated the food.
Parasites are organisms that derive nourishment and protection from other living organisms known as hosts. In the United States, the most common foodborne parasites are protozoa, roundworms, and tapeworms.
Most food poisoning is caused by bacteria, viruses, and parasites rather than toxic substances in the food. But, some cases of food poisoning can be linked to either natural toxins or chemical toxins.
Food allergy is an abnormal response to a food triggered by your body's immune system. Some foods, such as nuts, milk, eggs, or seafood, can cause allergic reactions in people with food allergies.
Food Contamination and Poisoning (NIH MedlinePlus)
Trusted health information on causes, symptoms, treatment, and prevention.
Foodborne Illness (CDC)
Questions and answers on illnesses, outbreaks, prevention, and more.
Foodborne Illness A-Z (CDC)
Directory of foodborne illnesses with links to detailed information.
Foodborne Illness & Disease (USDA)
General information plus links to information on specific diseases.
Bad Bug Book (FDA)
Basic facts regarding foodborne pathogenic microorganisms and natural toxins.