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. 2025 Jan 2;25:6. doi: 10.1186/s12879-024-10404-1

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© The Author(s) 2024

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Fig. 3 — Working algorithms for isolated reactive CIA sera. (A) The algorithm starting with the modified TPPA (titer, 1:20). (B) The algorithm starting with WB. Abbreviations: TPPA, Treponema pallidum particle agglutination assay; RPR, rapid plasma reagin test; WB, Western blotting; +, reactive; −, nonreactive; ±, indeterminate