It is estimated that one in five people suffer from an autoimmune disease. The National Institutes of Health (NIH) has identified over 80 different autoimmune diseases, and though their exact causes are usually unknown, most seem to be triggered by a combination of genetic predisposition and environmental causes. It is known that women make up about 78% of autoimmune patients, but it is not known why there is such a prevalence. Take this quiz to test your knowledge of autoimmune diseases.

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