Screening for infection was also negative (SARS-CoV-2, influenza, HIV-1/− 2 antibodies and HIV-1 antigen, viral hepatitis B and C, Borrelia burgdorferi IgM and IgG, Treponema pallidum IgM and IgG, TPHA, Varicella zoster DNA). Here, CD40LG is linked to infection.