The blood samples were obtained during the peripheral phase from three additional adult patients with a final diagnosis of a TBEV infection: a seronegative woman who later progressed to meningitis and seroconverted (blood only), a seronegative woman in the 3rd day of an abortive infection (paired blood and CSF), and an IgM-seropositive woman in the 7th day of an abortive infection (blood only). Here, CD40LG is linked to meningitis.