In the original article, there was a mistake in [Figure 2](#F1){ref-type="fig"} as published. One diagram (DAS28 vs. Th2), was mistakenly duplicated from another diagram (DAS28 vs. Th1) during the figure preparation. The corrected [Figure 2](#F1){ref-type="fig"} appears below.

![Increased follicular helper T (Tfh) cell differentiation correlates with rheumatoid arthritis (RA) disease activity. The percentages of CD4^+^ T cell subsets in the peripheral blood mononuclear cells from patients with RA were analyzed as Figure 1. The correlation between the frequencies of these subsets and the disease activities measured by DAS28 were determined using Spearman\'s correlation coefficient.](fimmu-10-02008-g0001){#F1}

The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.

[^1]: Edited by: Raffi Gugasyan, Burnet Institute, Australia

[^2]: Reviewed by: Xing Chang, Westlake Institute for Advanced Study (WIAS), China

[^3]: This article was submitted to T Cell Biology, a section of the journal Frontiers in Immunology

[^4]: †These authors have contributed equally to this work
