CXCR4 and dengue disease: According to qRT-PCR results, the expression levels of KLRC3, KLRF1, SRP19 and CXCR4 were higher in KBD and KBD with DF than controls, while expression levels of CLK1 and GPR18 were lower in both KBD and KBD with DF samples compared with healthy controls (shown in Fig. 2).