Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) X-linked hyper IgM syndrome ?
    ### Response:
    X-linked hyper IgM syndrome is a condition that affects the immune system and occurs almost exclusively in males. People with this disorder have abnormal levels of proteins called antibodies or immunoglobulins. Antibodies help protect the body against infection by attaching to specific foreign particles and germs, marking them for destruction.
    