Findings All patients, except one, possessed neutralizing antibodies against authentic SARS-CoV-2, which they retained at 90 days after onset.
3.2 Antibody responses against SARS-CoV-2 infection The geometric mean highest IgG and IgM titers against the RBD, ectodomain, and N protein and neutralization titers after 60 days post-onset decreased significantly from the peak titers.
Although the IgM titer against the RBD and the neutralization titer were predicted to drop below the limit of detection within 6 months,