Tehran University of Medical Sciences Iranian Journal of Allergy, Asthma and Immunology 1735-1502 3 1 2004 03 15 31 35 Bahram Mir Saeid Ghazi Asghar Aghamohammadi Ali Kouhi Abolhassan Farhoudi Mostafa Moin Nima Rezaei Parisa Shahriar Doost Masoud Movahedi Mohammad Gharagozlou Zahra Pourpak Saba Arshi Fereshteh Yazdani Lida Atarod Iraj Mohammad zadeh Nasrin Bazargan Akefeh Ahmadi Afshar Maryam Mahmoudi Amir Tahaei 2015 10 01 Primary immunodeficiencies (PID) are a group of disorders, characterized by an unusual susceptibility to infections. Delay in diagnosis results in increased morbidity and mortality in affected patients. The purpose of this study was to determine the mortality rate of Iranian immunodeficient patients referred to Children Medical Center Hospital affiliated to Tehran University of Medical Sciences over a period of 20 years. In this study, records of 235 (146 males, 89 females) patients with immunodeficiency who were diagnosed and followed in our center, during 22 years period (1979-2001) were reviewed. The diagnosis of immunodeficiency was based on the standard criteria. The cause of death was determined by review of death certificates. Antibody deficiency was the most common diagnosis made in our patients. The overall five-year survival rate was 22.7% in our studied patient group; this was greatest in antibody deficiency. During the 22 year period of study, 32 patients died. As some of the patients could not be located, the true mortality rate ranged between 13.6% and 17.5%. The main leading cause of death were lower respiratory tract involvement in 14 cases (44%). The most common pathogenic microorganisms causing fatal infections were psudomonas and staphylococcus in 9 cases (28.1%) followed by E. coli in 7 (21.9%), tuberculosis in 13 (40.6%) and salmonella in 1 (3.1%). Based on our study, delay in diagnosis in patients with PID results in tissue and organ damage and several complications. Mortality and morbidity are increased in undiagnosed patients. https://ijaai.tums.ac.ir/index.php/ijaai/article/view/65 https://ijaai.tums.ac.ir/index.php/ijaai/article/download/65/65