By performing blood cultures 1 and 2, IgM ELISA for leptospirosis, Widal test, and pan-neurotropic virus panel (pan-flavivirus RNA, pan-herpes DNA, pan-paramyxovirus RNA, human parvovirus B19, human adenoviruses, human para-echoviruses), all causes of fever with thrombocytopenia were ruled out (Figures 1-10). Here, CD40LG is linked to Thrombocytopenia.