IL15 and hemorrhagic fever with renal syndrome: The correlation analysis revealed that the increasing levels of plasma IL-15 in HFRS patients were positively correlated with serum Cr (r=0.2720, p=0.0446, Figure 3D), while negatively correlated with the platelet counts (r=−0.4369, p=0.0009, Figure 3E) in HFRS patients, indicating the elevated plasma IL-15 might correlated with the HFRS disease severity.