Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Parasites - African Trypanosomiasis (also known as Sleeping Sickness)? ?
    ### Response:
    There are two subspecies of the parasite Trypanosoma brucei that cause disease in humans. The clinical features of the infection depend on the subspecies involved. The two subspecies are found in different regions of Africa. At present, there is no overlap in their geographic distribution.
    