Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Human T-cell leukemia virus type 1 ?
    ### Response:
    What are the signs and symptoms of human T-cell leukemia virus, type 1? Human T-cell leukemia virus, type 1 (HTLV-1) generally causes no signs or symptoms. However, some affected people may later develop adult T-cell leukemia (ATL), HTLV-1 associated myelopathy/tropical spastic paraparesis (HAM/TSP) or other medical conditions.
    