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Microscopic polyangiitis is an Autoimmune disease that affects the small blood vessels of the body. Although its triggers are poorly understood, it's linked to the production of an antibody, p-ANCA, that affects those particular blood vessels. It can present with a prosaic constellation of symptoms including fever, loss of appetite, weight loss, fatigue, and in serious cases, kidney failure.

Like most autoimmune diseases, there is no cure for the condition, but a course of high dose prednisone or cyclophosphamide can alleviate the symptoms and slow the progression of the disease.

Microscopic polyangiitis at Wikipedia

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