Periodic Fever, Immunodeficiency, and Thrombocytopenia Syndrome, is also known as lazy leukocyte syndrome. An important gene associated with Periodic Fever, Immunodeficiency, and Thrombocytopenia Syndrome is WDR1 (WD Repeat Domain 1). Affiliated tissues include bone marrow and neutrophil, and related phenotypes are recurrent infections and b lymphocytopenia