Cytomegalovirus in primary immunodeficiency.

Area of Science:

• Immunology
• Virology
• Genetics

Background:

• Cytomegalovirus (CMV) infection is well-documented in secondary immunodeficiencies.
• Knowledge regarding CMV in primary immunodeficiencies (PIDs), characterized by inborn immune system errors, is limited.
• PIDs present unique diagnostic and management challenges for CMV disease.

Purpose of the Study:

• To describe the clinical significance of CMV infection in PIDs.
• To outline key immune defense components against CMV and their alterations in specific PIDs.
• To highlight CMV disease as an under-recognized complication in common variable immunodeficiency (CVID).

Main Methods:

• Literature review of CMV infection in primary immunodeficiencies.
• Analysis of clinical presentations, immune dysregulation, and iatrogenic immunosuppression in PID patients with CMV.
• Review of immune defense mechanisms against CMV and their impact in specific PIDs.

Main Results:

• CMV presentation in PID is often severe and accelerated by immune dysregulation and immunosuppression.
• CMV disease is under-recognized in common variable immunodeficiency (CVID).
• Individuals with CVID exhibit high rates of CMV end-organ disease, mortality, antiviral resistance, and prolonged treatment.

Conclusions:

• Clinicians should individualize CMV management based on the patient's immune deficit and maintain a high suspicion for CMV.
• Further research is needed for improved CMV risk stratification, diagnostics, and end-organ disease management in PID cohorts.
• Prompt treatment initiation is recommended due to the severity and potential complications of CMV in PID.