The levels of brucellosis serology were elevated on several occasions which resulted in him receiving five courses of treatment in different medical centers; Brucella IgM and IgG were 13.2 NTU and 16.6 NTU, respectively, (positive reference results > 11.0 NTU, borderline 9–11 NTU). Here, CD40LG is linked to brucellosis.