passages.id: split_6_test_534_passage
passages.type: progene_text
passages.text: Kaposi 's sarcoma - associated herpesvirus ( KSHV ) or human herpesvirus 8 ( HHV - 8 ) is a novel herpesvirus implicated as the causative agent of Kaposi 's sarcoma ( KS ) , primary effusion lymphoma , and some cases of multicentric Castleman 's disease .