Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) eosinophil peroxidase deficiency ?
    ### Response:
    Eosinophil peroxidase deficiency is a condition that affects certain white blood cells called eosinophils but causes no health problems in affected individuals. Eosinophils aid in the body's immune response. During a normal immune response, these cells are turned on (activated), and they travel to the area of injury or inflammation.
    