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Definition The human T-lymphotropic virus (HTLV) family has four members: HTLV-1, HTLV-2, HTLV-3, and HTLV-4. HTLV-1 causes two distinct types of disease: adult T-cell leukemia/lymphoma and several chronic inflammatory conditions, most notably HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). HTLV-2 rarely causes…