CD8A and COVID-19: Risk factors related to progression were reported in nonsevere COVID-19 patients, such as lymphocyte count, neutrophil count, CD4+ and CD8+ T cell counts, CRP, D-dimer, interleukin-6, interleukin-8, lactate dehydrogenase, age, dyspnoea on admission, and hypertension [10, 27–29].