Little is publicly known about the underlying factors causing the disease. Genetic factors are suspected, but the disease does not appear to be heritable. Also, something in the environment may trigger the disease.
Adult-onset immunodeficiency syndrome
Bare lymphocyte syndrome
Common variable immunodeficiency
Severe combined immunodeficiency
Wiskott–Aldrich syndrome
Hyper IgM syndrome
Hyper-IgM syndrome type 5
Hyper-IgM syndrome type 2