Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Cat scratch disease ?
    ### Response:
    Cat scratch disease is an infectious illness caused by the bacteria bartonella. It is believed to be transmitted by cat scratches, bites, or exposure to cat saliva. This self-limiting infectious disease is characterized by a bump or blister at the site of the bite or scratch and swelling and pain in the lymph nodes.
    