Likewise, a strong correlation (r = 0.89) was found between treponemal antibody levels detected by the DPP HIV-Syphilis and DPP HIV-Syphilis IgM assays in the 8 selected samples (Fig. 5B), whereas the preseroconversion samples tested antibody-negative by both immunoassays. The gene discussed is CD40LG; the disease is syphilis.