The Proportion of Treponema pallidum Polymerase Chain Reaction–Positive Primary Syphilis Infections That Are Seronegative for Syphilis: A Systematic Review and Meta-analysis. - Hughes, Yasmin; Towns, Janet M; Ong, Jason J; Chow, Eric P F; Fairley, Christopher K; Williamson, Deborah A; Bilardi, Jade; Hocking, Jane S; Pasricha, Shivani; Williams, Eloise; Azzato, Francesca; Chen, Marcus Y (Open Forum Infectious Diseases, 2025)