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 May 3;12:666114. doi: 10.3389/fimmu.2021.666114

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

Copyright © 2021 Kharlamova, Dunn, Bedri, Jerling, Almgren, Faustini, Gunnarsson, Rönnelid, Pullerits, Gjertsson, Lundberg, Månberg, Pin, Nilsson, Hober, Fink and Fogdell-Hahn

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

PMC Copyright notice

Percentage of the false positive test results for IgM antibodies against SARS-CoV-2. Samples from MS patients (n=10), DMARD naïve RF positive RA patients (n= 20), RF negative (n=20) RA patients, SLE patients (n=10), infliximab treated RA patients (n=8). The test code keys are described in Table 2 . Stars indicate significant difference between RF status in RA patients, using Fisher exact test, *p < 0.05, ****p < 0.0001. Pos, positive; neg, negative; n, number; RF, rheumatoid factor; IFX, infliximab; n/a, not applicable; RA, rheumatoid arthritis; MS, multiple sclerosis; SLE, systemic lupus erythematosus.