Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

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.

View full-text article in PMC

. 2021 Apr 7;11:7614. doi: 10.1038/s41598-021-87289-6

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

Performance of antibody tests assessed using samples with defined IgG antibody titers. The IgG titers, ranging from 80 to > 320, were determined using an in-house immunofluorescence assay (IFA). (A) The proportion of samples testing positive in rapid diagnostic IgG tests. The reference set of positive samples included 5 samples with a IgG titer of 80, 21 samples with a titer of 160, 39 samples with a titer of 320, and 22 samples with a IFA titer of > 320. (B) The proportion of samples testing positive in platform-based assays. Epitope, Euroimmun, and in-house RV were evaluated using 220 positive samples and Abbot, Mabtech, and Wantai were evaluated using 104, 217, and 178 positive reference samples, respectively. Among the tested reference samples, 45 tested negative at a dilution of 1:80 (< 80) using IFA, 14 samples had a titer of 80, 39 samples had a titer of 160, 64 samples had a titer of 320, and 58 samples had an IFA titer of > 320.