CD40LG and Microscopic hematuria: • Clinical symptoms: apathetic, appetite loss, skin rash, slight proteinuria, microhematuria• Recover from illness, no clinical symptoms at late time points• No abnormalities in heart, lung, urinary bladder, brain, aorta, glomeruli, cortex• No changes in blood chemistry• Slight abnormalities in tubules of kidneys (medullary epithelium: pycnotic nuclei, desquamated cells)• Detection of viral antigens (N, Gn/Gc) in kidney sections• Seroconversion: PUUV-specific IgA, IgM and IgG antibodies