Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Whipple Disease ?
    ### Response:
    Bacteria called Tropheryma whipplei (T. whipplei) cause Whipple disease. T. whipplei infection can cause internal sores, also called lesions, and thickening of tissues in the small intestine. The villi take on an abnormal, clublike appearance and the damaged intestinal lining does not properly absorb nutrients, causing diarrhea and malnutrition.
    