Skip to main content
. 2021 Aug;109:199–202. doi: 10.1016/j.ijid.2021.07.003

Figure 1.

Figure 1

Anti-SARS-CoV-2 S1/S2 IgG antibody serum levels (A) and neutralizing serum titers (B) in SARS-CoV-2-seropositive subjects with no SARS-CoV-2 secondary infection (n=313 for anti- SARS-CoV-2 S1/S2 IgG antibody and n=13 for neutralizing antibody) or with secondary infection (n=7). Median levels (and interquartile range for subjects with no secondary infection) are shown. Dotted horizontal lines represent cutoff levels for positive results (≥15 arbitrary units (AU)/ml for anti-SARS-CoV-2 S1/S2 IgG antibody and ≥1:10 neutralizing serum titer). Each symbol represents an individual.