Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Idiopathic neutropenia ?
    ### Response:
    Idiopathic neutropenia is an acquired form of severe chronic neutropenia whose cause is unknown. Neutropenia is a blood condition that causes a reduced number or complete absence of neutrophils, a type of white blood cell that is responsible for much of the body's protection against infection.
    