Most frequently, food poisoning may be due to infection caused by bacteria, viruses, parasites, and infrequently, prions. More than 200 infectious causes exist. Sometimes it is not the bacteria that causes the problem but the toxin that bacteria produce in the food before it is eaten. This is the case with Staphylococcal food poisoning and with botulism.
Other illnesses may involve chemical toxins that are produced in certain foods that are poorly cooked or stored. For example, scombroid poisoning occurs due to a large release of histamine chemical from the fish when it is eaten. It causes facial swelling, itching, and difficulty breathing and swallowing - just like an allergic reaction. Scombroid poisoning is sometimes confused with a shellfish allergy.
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*Causes of food poisoning
*Causes of food poisoning
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