“…Individuals who are infected with SARS-CoV-2 develop both cellular and humoral immune responses to the virus ( Robbiani et al, 2020 ; Gaebler et al, 2020 Preprint ; Suthar et al, 2020 ; Ni et al, 2020 ; Grifoni et al, 2020 ; Peng et al, 2020 ; Sekine et al, 2020 ; Rydyznski Moderbacher et al, 2020 ; Braun et al, 2020 ; Zhou et al, 2020 ). Antibody responses develop to most of the structural proteins expressed by the virus, and nearly all individuals develop neutralizing antibodies directed to the receptor binding domain of the Spike trimer (S; Robbiani et al, 2020 ; Gaebler et al, 2020 Preprint ; Suthar et al, 2020 ; Ni et al, 2020 ; Lumley et al, 2020 Preprint ). Cellular immune responses can be broad but vary widely ( Grifoni et al, 2020 ; Peng et al, 2020 ; Sekine et al, 2020 ; Rydyznski Moderbacher et al, 2020 ; Braun et al, 2020 ; Zhou et al, 2020 ), and lymphopenia is a prominent feature of more severe infection, affecting CD4 + and CD8 + T cells, as well as B cells ( Tavakolpour et al, 2020 ; Chen and John Wherry, 2020 ; Huang et al, 2020 ; Giamarellos-Bourboulis et al, 2020 ; Tan et al, 2020 ; Kuri-Cervantes et al, 2020 ; Mathew et al, 2020 ).…”