Izazi Arbain1, Zarina Thasneem Zainudeen1, Intan Juliana Abd Hamid1
Primary immunodeficiencies (PIDs), recently reclassified as inborn errors of immunity (IEIs), represent a heterogeneous group of over 500 genetically defined disorders that impair the development or function of the immune system. Although individually rare, collectively they have a significant globa...