VEGFA and hemorrhagic fever with renal syndrome: Then, we analyzed the serum VEGF level in HFRS patients at each stage of the disease irrespective of the different severities; the mean level of serum VEGF was increased from the fever onset, reached the peak level at diuretic stage and still maintained a certain level at convalescence, and decreased to normal level when detected 8 months after discharge (Table 2).