In accordance with several previous reports, our results revealed that patients with mild or moderate symptoms were shown to have an apparent increase in follicular helper CD4 T cells (TFH) and germinal centre B (GCB) cells, while severe COVID‐19 patients displayed dysregulation of lymphocytes characterized by a profound depletion of CD4+ lymphocytes and subsequently B cell lymphopenia.26 Here, CD4 is linked to COVID-19.