Figure 3. Correlation between Neutralizing Antibody Titer and N Gene Cycle Threshold as Indication of Infectivity.
The results of antigen-detecting (Ag) rapid diagnostic testing for the presence of SARS-CoV-2 are shown, along with neutralizing antibody titers and N gene cycle threshold (Ct) values in 22 fully vaccinated health care workers with breakthrough infection for whom data were available (slope of regression line, 171.2; 95% CI, 62.9 to 279.4).