One-year durability of anti-spike IgG to SARS-CoV-2: preliminary data from the AntiCROWN prospective observational study One year durability of COVID-19 anti-spike IgG.

Data are presented of 368/503 post-COVID-19 outpatients followed within the AntiCROWN Cohort who have a one-year control and a baseline assessment of anti-S1/S2 antibodies, detected with the The LIAISON® SARS-CoV-2 S1/S2 IgG solution by DiaSorin. Loss of response occurred in 4 subjects having a baseline level below 50 AU/mL.