CD4 and COVID-19: The HLA associations reported here may be considered complementary to the earlier identification of multiple SARS-CoV-2 HLA class I and HLA class II peptides as potential T cell epitopes in COVID-19 convalescent patients, on the one hand [10], and the identification of CD4 and CD8 T cell populations responsive to SARS-CoV-2 HLA class I and HLA class II predicted peptide “megapools”, on the other [29].