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Dynamic changes in peripheral blood lymphocyte subsets in adult patients with COVID-19
Zhifeng Deng1, Minli Zhang2, Ting Zhu1
1Department of Otolaryngology - Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China.
Insights
Peripheral blood lymphocyte subsets (CD3+, CD4+, CD8+) decrease during COVID-19 illness, correlating with disease severity and prognosis. Monitoring these immune cells aids in assessing COVID-19 patient outcomes.
Area of Science:
- Immunology
- Virology
- Infectious Diseases
Background:
- Coronavirus disease 2019 (COVID-19), caused by SARS-CoV-2, is a significant global health concern.
- Understanding the immune response, particularly changes in lymphocyte subsets, is crucial for managing COVID-19.
- This study focuses on dynamic alterations in peripheral blood lymphocyte subsets in adult COVID-19 patients.
Purpose of the Study:
- To investigate the dynamic changes in peripheral blood lymphocyte subsets in adult patients diagnosed with COVID-19.
- To correlate lymphocyte subset levels with disease severity and patient prognosis.
Main Methods:
- Retrospective analysis of electronic medical records from 435 hospitalized COVID-19 patients.
- Extraction and analysis of demographic, clinical, comorbidity, laboratory, and radiological data.
- Comparison of lymphocyte subset counts (CD3+, CD4+, CD8+, CD19+, CD16/56+) weekly post-illness onset and with healthy controls.
Main Results:
- Lymphocyte subsets were reduced at 1 week, reaching a nadir by week 2, and gradually increased, returning to near-normal by week 5.
- Counts remained lower than healthy controls even after recovery.
- Significantly lower CD3+, CD4+, and CD8+ counts were observed in severe COVID-19 cases and non-survivors compared to non-severe cases and survivors.
Conclusions:
- Peripheral blood lymphocyte subset levels (CD3+, CD4+, CD8+) are linked to COVID-19 progression, severity, and patient prognosis.
- Dynamic monitoring of immune function provides key indicators for evaluating COVID-19 severity and predicting outcomes.
- This monitoring is valuable for guiding appropriate treatment strategies in COVID-19 management.
Introduction:
Coronavirus disease 2019 (COVID-19), caused by infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has spread widely. The aim of this study was to investigate the dynamic changes in peripheral blood lymphocyte subsets in adult patients with COVID-19.
Methods:
The electronic medical records were reviewed. Data including demographic characteristics, clinical manifestations, comorbidities, laboratory data, and radiological examinations of 435 hospitalized COVID-19 patients with a confirmed SARS-CoV-2 viral infection were extracted and analyzed retrospectively. Lymphocyte subset counts at each week after the onset of the illness were compared with those of the other weeks of illness and with those of control individuals.
Results:
The various lymphocyte subsets (CD3+, CD4+, CD8+, CD19+, and CD16/56+) were below the normal ranges at 1 week after the onset of illness, reaching a nadir during the second week. They increased gradually during the third week and returned to normal levels in the fifth week, but were still lower than those of the healthy controls. The CD3+, CD4+, and CD8+ counts were significantly lower in patients with severe disease compared to those with non-severe disease, and in patients who died compared to those who recovered.
Discussion:
This research indicates that the levels of peripheral blood lymphocyte subsets (CD3+, CD4+, and CD8+) are associated with disease progression and severity, and with the prognosis in patients with COVID-19. Dynamic monitoring of human immune function is one of the indicators for evaluating the severity of disease and the prognosis of COVID-19 patients, and is useful for formulating appropriate treatment strategies.
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