Anti-spike IgG Avidity Enhances Neutralization of Severe Acute Respiratory Syndrome Coronavirus 2: A Prospective Study of Primary Infections and Immunizations. - Nurmi V; Hedman L; Vapalahti K; Hepojoki J; Uğurlu H; Iheozor-Ejiofor R; Knight C; Saksela K; Kantele A; Hedman K; Vapalahti O (The Journal of infectious diseases, 2026)