| Anti-N |
---|
Positive | Negative |
---|
Anti-S | Positive |
\(p=0.94\)
|
\(p=0.99\)
|
Negative |
\(p=0\)
|
\(p=0.19\)
|
- Anti-S negative may occur after vaccination in case of a delayed or an absence of antibody response. Moreover, Ro-RBD-Ig (anti-S) with a cut-off at 0.115 does not provide 100% sensitivity and specificity