Syphilis screening was reactive in 12.5% (6/48); two cases (4.2%; 95% CI: 0.9–12.7) met criteria for treatment‐requiring infection (positive IgM antibody test and a reactive lipoid antibody test), and four (8.3%; 95% CI: 2.9–18.6) reflected past infection. The gene discussed is CD40LG; the disease is syphilis.