KSHV⁺ cells are present in various mouse organs after iv injections of KSHV⁺ cells. (A) Mouse kidney with rare vIL-6⁺ (BCP-1) cells infiltrating parenchyma. (B) KSHV vIL6⁺ BCP-1 cells in retroperitoneal fat. (C) Mouse thymus showing numerous small mouse lymphocytes with a small population of larger BCP-1 cell infiltrate, one stained positive for vIL-6.