Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Wiskott-Aldrich syndrome ?
    ### Response:
    Wiskott-Aldrich syndrome is characterized by abnormal immune system function (immune deficiency) and a reduced ability to form blood clots. This condition primarily affects males.  Individuals with Wiskott-Aldrich syndrome have microthrombocytopenia, which is a decrease in the number and size of blood cells involved in clotting (platelets).
    