As of 2020, there are 431 IEIs, which are divided into three categories: *Primary immunodeficiencies *Mendelian infections *Monogenic infections
Inborn errors of immunity
Combined immunodeficiencies
Primary immunodeficiency
MOG antibody disease
Transient hypogammaglobulinemia of infancy
Selective immunoglobulin A deficiency
Neonatal adrenoleukodystrophy
Inborn errors of metabolism