Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Human T-cell leukemia virus type 1 ?
    ### Response:
    How is human T-cell leukemia virus, type 1 diagnosed? Human T-cell leukemia virus, type 1 (HTLV-1) is usually diagnosed based on blood tests that detect antibodies to the virus. However, HTLV-1 is often never suspected or diagnosed since most people (95%) never develop any signs or symptoms of the infection.
    