BACKGROUND: Immune reconstitution inflammatory syndrome (IRIS) is a phenomenon initially described in patients with human immunodeficiency virus. Upon initiation of combination antiretroviral therapy, recovery of cellular immunity triggers inflammation to a preexisting infection or antigen that causes paradoxical worsening of clinical disease. A similar phenomenon can occur in human immunodeficiency virus-negative patients, including pregnant women, neutropenic hosts, solid-organ or stem cell transplant recipients, and patients receiving tumor necrosis factor inhibitors. OBSERVATIONS: We report a case of leprosy unmasking and downgrading reaction after stem cell transplantation that highlights some of the challenges inherent to the diagnosis of IRIS, especially in patients without human immunodeficiency virus infection, as well as review the spectrum of previously reported cases of IRIS reactions in this population. CONCLUSIONS: The mechanism of immune reconstitution reactions is complex and variable, depending on the underlying antigen and the mechanism of immunosuppression or shift in immune status. Use of the term IRIS can aid our recognition of an important phenomenon that occurs in the setting of immunosuppression or shifts in immunity but should not deter us from thinking critically about the distinct processes that underlie this heterogeneous group of conditions.
BACKGROUND: Immune reconstitution inflammatory syndrome (IRIS) is a phenomenon initially described in patients with human immunodeficiency virus. Upon initiation of combination antiretroviral therapy, recovery of cellular immunity triggers inflammation to a preexisting infection or antigen that causes paradoxical worsening of clinical disease. A similar phenomenon can occur in human immunodeficiency virus-negative patients, including pregnant women, neutropenic hosts, solid-organ or stem cell transplant recipients, and patients receiving tumornecrosis factor inhibitors. OBSERVATIONS: We report a case of leprosy unmasking and downgrading reaction after stem cell transplantation that highlights some of the challenges inherent to the diagnosis of IRIS, especially in patients without humanimmunodeficiency virus infection, as well as review the spectrum of previously reported cases of IRIS reactions in this population. CONCLUSIONS: The mechanism of immune reconstitution reactions is complex and variable, depending on the underlying antigen and the mechanism of immunosuppression or shift in immune status. Use of the term IRIS can aid our recognition of an important phenomenon that occurs in the setting of immunosuppression or shifts in immunity but should not deter us from thinking critically about the distinct processes that underlie this heterogeneous group of conditions.
Authors: F Pieroni; A B P L Stracieri; D A Moraes; E J A Paton; F P Saggioro; G M N Barros; J C Barros; M C B Oliveira; M A Coutinho; N S Castro; A C Vigoritto; P Trabasso; C A Souza; M P de Souza; M A Mauad; V A R Colturato; B P Simões; N P Foss; J C Voltarelli Journal: Bone Marrow Transplant Date: 2007-08-27 Impact factor: 5.483
Authors: Elizabeth A Misch; Murdo Macdonald; Chaman Ranjit; Bishwa R Sapkota; Richard D Wells; M Ruby Siddiqui; Gilla Kaplan; Thomas R Hawn Journal: PLoS Negl Trop Dis Date: 2008-05-07
Authors: Ana Paula Vieira; Maria Angela Bianconcini Trindade; Flávio Jota de Paula; Neusa Yurico Sakai-Valente; Alberto José da Silva Duarte; Francine Brambate Carvalhinho Lemos; Gil Benard Journal: BMC Infect Dis Date: 2017-04-24 Impact factor: 3.090