DIESSE Diagnostica Senese S.p.A. is an Italian company that develops, manufactures, and markets in vitro diagnostic products. The company's product portfolio includes tests for autoimmune diseases, infectious diseases, and hematology. DIESSE has a global presence, with subsidiaries in the United States, France, Germany, and China. The company's products are sold in more than 100 countries worldwide. DIESSE was founded in 1984 and is headquartered in Siena, Italy.