CD40LG and syphilis: Biological investigations revealed the following (Table 1): CD4 = 130 cells/mm3; HIV viral load = 171,000 copies/mL; viral markers for hepatic viruses: HBs antigen positive, anti-HCV antibodies negative, HBV viral load - 206,000 copies/mL, HDV IgM and IgG negative; syphilis serology - RPR: positive; VDRL: positive; CMV serology: IgG positive, IgM negative; Toxoplasma gondii serology: IgG positive, IgM negative.