The human T-lymphotropic virus type 1 (HTLV-1) was the first retrovirus reported in
humans, and it is a cellular transforming agent. It has the capacity to produce tumors of
T-cells, neurologic diseases and possibly immunosuppression. The HTLV-1 has been
associated with the etiology of several diseases, such as the adult T-cell leukemia/lymphoma,
HTLV-1-associated myelopathy and tropical spastic paraparesis.