MONDO_0015700 (immunodeficiency due to a late component of complement deficiency) is a genetic deficiency of any membrane attack complex (MAC, also known as terminal component complex (TCC)) component of the complement system (C5, C6, C7, C8, C9). Deficiencies of the terminal complement pathway results in a predisposition to infections, such as invasive meningococcal disease or disseminated gonococcal infection. Also known as: deficiency of complement of terminal pathway, immunodeficiency due to C5 to C9 component complement deficiency, immunodeficiency due to a C5 to C9 component complement deficiency, terminal complement pathway deficiency.