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[Severe mixed immunodeficiency. Report of a case]
Insights
Severe combined immunodeficiency (SCID) in an infant presented as refractory mucocutaneous candidiasis. Despite treatment attempts, the child succumbed to opportunistic infections, highlighting challenges in managing this genetic disorder.
Area of Science:
- Immunology
- Genetics
- Pediatrics
Background:
- Severe combined immunodeficiency (SCID) is a group of rare genetic disorders characterized by profound defects in both cellular and humoral immunity.
- X-linked SCID (X-linked SCID) is the most common form, affecting males and presenting in infancy with recurrent infections.
- Mucocutaneous candidiasis resistant to treatment is a common early sign of SCID.
Purpose of the Study:
- To present the case of a male infant diagnosed with X-linked SCID.
- To document the clinical course, diagnostic challenges, and treatment outcomes.
- To highlight the pathological findings in a fatal case of X-linked SCID.
Main Methods:
- Clinical case presentation and diagnostic workup.
- Family history investigation, including post-mortem diagnosis in a relative.
- Treatment with transfer factor and hyperimmune plasma.
- Autopsy for pathological examination.
Main Results:
- The infant presented with severe mucocutaneous candidiasis unresponsive to therapy.
- Family history revealed early deaths in affected males, with one diagnosed with SCID post-mortem.
- Hematopoietic stem cell transplantation was not feasible due to lack of histocompatible relatives.
- The child died from respiratory failure secondary to Pneumocystis carinii pneumonia and cytomegalovirus infection.
- Autopsy confirmed widespread opportunistic infections and near-complete absence of lymphoid tissue.
Conclusions:
- X-linked SCID requires early diagnosis and definitive treatment, ideally hematopoietic stem cell transplantation.
- Opportunistic infections are a major cause of mortality in untreated SCID.
- The absence of histocompatible donors poses a significant therapeutic challenge.
- This case underscores the importance of recognizing early clinical signs and the devastating consequences of delayed diagnosis and treatment.
Abstract:
The case of a 3 month old child with severe combined sex linked immunodeficiency is presented. The diagnosis was well doccumented, during his life. The child presented as a case of mucocutaneous moniliasis resistant to treatment. There was a history of similar cases in the family; diagnosis was made at post-mortem in one cousin and death occurred at early age in all kins so affected. Blood marrow transplant was not feasible in our case because histocompatibility was lacking in the kins studied. Three units of transfer factor were given as well as hyperimmune plasma but the child died in respiratory failure. Autopsy demonstrated pulmonary infection by Pneumocystic carinii and generalized citomegalic inclussion virus infection; almost complete absence of immune tissue was also demonstrated.