Immunodeficiency 44, also known as imd44, is related to primary immunodeficiency with post-measles-mumps-rubella vaccine viral infection and immunodeficiency 45. An important gene associated with Immunodeficiency 44 is STAT2 (Signal Transducer And Activator Of Transcription 2), and among its related pathways/superpathways are Innate Immune System and Cytokine Signaling in Immune system. Related phenotypes are encephalopathy and lymphopenia