CD4 and infection: Early in the infection at week 1, the proportions of SARS-CoV-2-specific IFNγ+CD4+ and IFNγ+CD8+ T cells in the survival group reached mean values of 0.021 and 0.027%, respectively, then gradually increased to 0.263 and 0.337%, respectively, as hypertensive patients clinically recovered at week 4 (Table 2, Figures 3A, B).