Immunodeficiency 73a with Defective Neutrophil Chemotaxis and Leukocytosis, also known as neutrophil immunodeficiency syndrome, is related to immune deficiency disease and clostridium difficile colitis. An important gene associated with Immunodeficiency 73a with Defective Neutrophil Chemotaxis and Leukocytosis is RAC2 (Rac Family Small GTPase 2), and among its related pathways/superpathways are Signal Transduction and Signaling by Rho GTPases. Affiliated tissues include neutrophil and skin, and related phenotypes are immunodeficiency and leukocytosis