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Flow chart. Patients included in the study, patients with elevated Treponema pallidum-specific IgG antibodies determined by electrochemiluminescence immunoassay (TP-ECLIA), and patients with indicators of active infection receiving antibiotics are listed. AI = antibody index; CSF = cerebrospinal fluid; IgM = immunoglobulin M; TP = Treponema pallidum; RPR = Rapid Plasma Reagin test
