Increased IL-10-producing regulatory T cells are characteristic of severe cases of COVID-19.

This is tentatively supported by results showing HIV‐positive patients with a slight trend towards poorer COVID‐19 outcome. 36 , 37 , 38 In addition, patients who received haematopoietic stem cell transplantation (HSCT), which leads to profound T‐cell lymphopenia, 39 seem to have a worse outcome after SARS‐CoV‐2 infection, since preliminary data suggest 30% mortality acco

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