{Reference Type}: Letter {Title}: Discriminating endogenous vaccine-elicited anti-Spike antibody responses from exogenous anti-Spike monoclonal antibodies: The case of Evusheld. {Author}: Focosi D;Maggi F;Shoham S;Casadevall A; {Journal}: J Med Virol {Volume}: 95 {Issue}: 1 {Year}: 01 2023 {Factor}: 20.693 {DOI}: 10.1002/jmv.28277 {Abstract}: