Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Human T-cell leukemia virus type 2 ?
    ### Response:
    Human T-cell leukemia virus, type 2 (HTLV-2) is a retroviral infection that affect the T cells (a type of white blood cell). Although this virus generally causes no signs or symptoms, scientists suspect that some affected people may later develop neurological problems and/or chronic lung infections.
    