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Patent Pending Kaposi sarcoma (/kəˈpoʊsiː sɑrˈkoʊmə/; KS) is a tumor caused by infection with human herpesvirus 8 (HHV8), also known as Kaposi sarcoma-associated herpesvirus (KSHV) or KS agent. It was originally described by Moritz Kaposi, a Hungarian dermatologist practicing at the University of Vienna in 1872.