Related Experiment Video
Updated: Dec 18, 2025
06:03
Author Spotlight: Advancing Immune Monitoring in Critical Care Patients Using Whole Blood Assays
Published on: September 20, 2024
1.6K
Lymphocyte Subset Counts in COVID-19 Patients: A Meta-Analysis
Wei Huang1, Julie Berube2, Michelle McNamara1
1BD Biosciences, San Jose, California, USA.
Summary
Severe COVID-19 patients consistently show reduced lymphocyte counts, particularly CD4+ and CD8+ T-cells. These T-cell reductions are significant predictors of patient outcomes in coronavirus disease 2019.
Area of Science:
- Immunology
- Virology
- Hematology
Background:
- Hospitalized coronavirus disease 2019 (COVID-19) patients frequently exhibit altered white blood cell counts, specifically reduced lymphocytes and elevated neutrophils.
- Lymphocyte subset counts are critical indicators of immune status and disease progression.
Purpose of the Study:
- To investigate the reduction of lymphocyte subset counts in COVID-19 patients across multiple studies.
- To correlate these reductions with COVID-19 disease severity and patient outcomes.
Main Methods:
- A meta-analysis of 20 peer-reviewed studies was conducted.
- Studies were selected based on reporting lymphocyte subset counts and COVID-19 disease severity.
- Statistical analysis was performed to compare counts between disease severity groups.
Main Results:
- Significant reductions in CD4+ T cells, CD8+ T cells, B cells, NK cells, and total lymphocytes were observed in severe/critical COVID-19 cases compared to mild/moderate cases.
- T-cell subsets (CD4+ and CD8+) demonstrated the most substantial changes.
- Multivariate analyses indicated that CD4+ and/or CD8+ T-cell counts independently predict patient outcomes.
Conclusions:
- Reduced lymphocyte subset counts, especially T-cells, are characteristic of severe COVID-19.
- These immunological changes are significant indicators of disease severity and potential patient outcomes.
