Differential alterations in peripheral lymphocyte subsets in COVID-19 patients: upregulation of double-positive and double-negative T cells

Abstract

Background: Viral infections cause alteration in the total number of lymphocytes and their subset distribution. We aimed to study peripheral blood lymphocyte subsets in COVID-19 patients and to correlate these subsets with clinical and laboratory data, which may help in clarifying the pathogenesis to develop novel diagnostic and prognostic biomarkers for COVID-19.
Methods: Twenty-six reverse-transcription polymerase chain reaction (RT-PCR) confirmed COVID-19 patients were subjected to medical history-taking and a thorough clinical examination. Laboratory tests included complete blood count, D dimer, ferritin, and C-reactive protein (CRP). Chest CT was used to diagnose COVID-19 pneumonia. Lymphocyte subsets were compared with those in 20 healthy controls using flow cytometry.
Results: Leucopenia, relative neutrophilia, lymphopenia, eosinopenia together with marked elevation in neutrophil/lymphocyte ratio were observed in our COVID-19 patients. A marked reduction was observed in T cells, including both CD4 and CD8 cells, natural killer (NK), and natural killer T cells (NKT). Double-positive T (DPT) cells, double-negative T (DNT) cells, and B cells were elevated in the patients relative to the other lymphocyte subsets.
Conclusion: Immune-inflammatory parameters are of utmost importance in understanding the pathogenesis and in the provisional diagnosis of COVID-19. Yet, due care must be taken during their interpretation because of the vast discrepancies observed between studies even in the same locality. Further studies are needed to clarify the role of B cells, DPT, and DNT cells in the pathogenesis and control of COVID-19.

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Author Biography

Khalid A. Nasif, Department of Biochemistry, Faculty of Medicine, Minia University, Minia

College of Medicine, King Khalid University, Abha, Saudi Arabia

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Published
2021-06-10
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Original Research Articles
Keywords:
COVID-19, SARS-CoV-2, lymphocyte subsets, double-positive T cells, double-negative T cells
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How to Cite
Zahran, A. M., Zahran, Z. A. M., Mady, Y. H., Mahran, E. E. M., Rashad, A., Makboul, A., Nasif, K. A., Abdelmaksoud, A. A., & El-Badawy , O. (2021). Differential alterations in peripheral lymphocyte subsets in COVID-19 patients: upregulation of double-positive and double-negative T cells. Multidisciplinary Respiratory Medicine, 16. https://doi.org/10.4081/mrm.2021.758