Fig. 6From: Impact of immune checkpoint molecules on FoxP3+ Treg cells and related cytokines in patients with acute and chronic brucellosisCorrelations between serum TGF-β1 and various factors. Spearman’s correlation coefficient (R) was used to evaluate correlations between increased serum TGF-β1 levels and the frequency of Tregs (A) and expression of CTLA-4 (B), GITR (C), and PD-1 (D) on Tregs in acute and chronic brucellosis (n = 49)Back to article page