Interestingly, IPS/FVS-cross-reactive T cells were detected in two out of two CMV+ HLA-B*35:01+ patients suffering from severe COVID-19, whereas the cross-reactive T cells were detected in 3 out of 37 healthy CMV+ HLA-B*35:01+ donors (Figures 4C and 6E). Here, HLA-B is linked to COVID-19.