CD4 and coinfection: Compared to severely ill COVID-19 patients and patients with fatal COVID-19 outcomes, the asymptomatic COVID-19 patients presented high rates of co-infection with the α-CCC species and more functional and less exhausted α-CCCs/SARS-CoV-2 cross-reactive memory CD4+ and CD8+ T cells, targeting structural, non-structural, and accessory proteins.