<prompt> Haemopoietic malignancy is seen inHTLV -1EBVParvo B19HHV - 8  <response>: Human T-cell leukemia virus type 1 HTLV-1 is a causative agent of a malignant disease of peripheral CD4 T cells called adult T-cell leukemia-lymphoma ATL and several inflammatory diseases such as HTLV-1-associated myelopathytropical spastic paraparesis HAMTSP. Ref Davidson 23rd edition pg 1091 