T lymphocyte subset changes in human immunodeficiency virus infection.

Area of Science:

• Immunology
• Virology
• Clinical Medicine

Background:

• Human immunodeficiency virus (HIV) infection is a global health concern.
• T cell subset counts, particularly CD4+ and CD8+ T cells, are critical indicators of immune status.
• Understanding T cell dynamics is crucial for monitoring HIV disease progression.

Purpose of the Study:

• To determine the absolute counts of CD4+ and CD8+ T cells in HIV-infected individuals.
• To correlate T cell subset counts with clinical staging of HIV disease (CDC classification).
• To assess the diagnostic utility of T cell counts in distinguishing HIV stages and opportunistic infections.

Main Methods:

• Immunomagnetic technique used for direct enumeration of CD4+ and CD8+ T cells in peripheral blood.
• Study included 75 healthy controls and 223 HIV-infected individuals.
• Clinical classification of HIV-seropositive individuals based on CDC criteria.

Main Results:

• HIV-infected individuals showed an early and sustained increase in CD8+ T cells compared to controls.
• Median CD8+ T cell counts in CDC groups II, III, and IV C2 were double that of controls.
• Patients with Acquired Immunodeficiency Syndrome (AIDS) had CD8+ T cell counts similar to controls.
• A decrease in CD4+ T cells correlated with clinical deterioration in HIV-infected individuals.
• T cell subset counts effectively differentiated healthy seropositive individuals from those with HIV-related disease and patients with AIDS from those with other opportunistic infections.

Conclusions:

• Absolute CD4+ and CD8+ T cell counts are valuable biomarkers in HIV infection.
• T cell subset analysis provides insights into immune system changes during HIV progression.
• T cell counts aid in clinical staging and differentiating HIV-related conditions.