Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Proportion of wrongly classified specimen serostatus. (A) shows proportions of pre-pandemic (negative) specimens wrongly classified as positive (false positives). (B) shows proportions of antibody-peak specimens from PCR-confirmed subjects (positives) wrongly grouped as negative (false negative) using the five different methods of computing cut-off values.
