A systematic review of syphilis serological treatment outcomes in HIV-infected and HIV-uninfected persons: rethinking the significance of serological non-responsiveness and the serofast state after therapy.
Open accessAbstract
BACKGROUND: Syphilis remains a global public health threat and can lead to severe complications. In addition to resolution of clinical manifestations, a reduction in nontreponemal antibody titers after treatment is regarded as "proof of cure." However, some patients manifest < 4-fold decline ("serological non-response") or persistently positive nontreponemal titers despite an appropriate decline ("serofast") that may represent treatment failure, reinfection, or a benign immune response. To delineate these treatment phenomena, we conducted a systematic review of the literature regarding serological outcomes and associated factors among HIV-infected and -uninfected subjects. METHODS: Six databases (PubMed, Embase, CINAHL, Web of Science, Scopus, and BIOSIS) were searched with no date restrictions. Relevant articles that evaluated serological treatment responses and correlates of serological cure (≥ four-fold decline in nontreponemal titers) were included. RESULTS: We identified 1693 reports in the literature, of which 20 studies met selection criteria. The median proportion of patients who had serological non-response was 12.1% overall (interquartile range, 4.9-25.6), but varied depending on the time points after therapy. The serofast proportion could only be estimated from 2 studies, which ranged from 35.2-44.4%. Serological cure was primarily associated with younger age, higher baseline nontreponemal titers, and earlier syphilis stage. The relationship between serological cure and HIV status was inconsistent; among HIV-infected patients, CD4 count and HIV viral load was not associated with serological cure. CONCLUSIONS: Serological non-response and the serofast state are common syphilis treatment outcomes, highlighting the importance of determining the immunological and clinical significance of persistent nontreponemal antibody titers after therapy.
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Clinical trial data demonstrate that 10%-20% of persons with primary and secondary syphilis treated with recommended therapy will not achieve a fourfold decrease in nontreponemal titer within 12 months after treatment.
“However, clinical trial data have demonstrated that 10%–20% of persons with primary and secondary syphilis treated with the recommended therapy will not achieve the fourfold decrease in nontreponemal titer within 12 months after treatment (591,596,597).”
From Sexually Transmitted Infections Treatment Guidelines, 2021 (2021) · cites this paper as [597]
The Results (Frequency of serological outcomes after therapy; no page given) report 11.2% serological non-response at ≥12 months, but that figure covers all stages of syphilis. The Results (Study characteristics, Tables 1–2; no page given) include a clinical trial with 9.7% non-response at 12 months after a recommended penicillin regimen, but its participants also included early latent syphilis. The review therefore supports the general finding, not the stated 10%–20% estimate specifically for primary and secondary syphilis. (LLM, conf=0.86)
Experimental — accuracy not yet measuredSerologic response to treatment appears associated with syphilis stage; earlier stages are more likely to decrease fourfold and become nonreactive.
“Serologic response to treatment appears to be associated with multiple factors, including the person’s syphilis stage (earlier stages are more likely to decrease fourfold and become nonreactive)”
From Sexually Transmitted Infections Treatment Guidelines, 2021 (2021) · cites this paper as [597]
The Results section, “Association of serological outcomes with stage of syphilis” (page unavailable), reports that earlier stages were associated with a greater likelihood of serological cure. But the Methods define cure as a fourfold titer decline OR seroreversion to nonreactive results; the review does not establish that earlier-stage patients are more likely to achieve both outcomes, or seroreversion specifically. (LLM, conf=0.84)
Experimental — accuracy not yet measuredSerologic response to treatment appears associated with initial nontreponemal antibody titers; titers <1:8 are less likely to decline fourfold than higher titers.
“initial nontreponemal antibody titers (titers <1:8 are less likely to decline fourfold than higher titers)”
From Sexually Transmitted Infections Treatment Guidelines, 2021 (2021) · cites this paper as [597]
The Results section on baseline nontreponemal titers reports that ten studies associated higher initial titers with a greater likelihood of serological cure, supporting the general association. It does not establish <1:8 as the cutoff for a lower likelihood of fourfold decline; it also reports that lower titers (≤1:8) were associated with more seroreversion in one early-syphilis study. Page numbers were not available in our copy. (LLM, conf=0.85)
Experimental — accuracy not yet measuredIn a more recent meta-analysis, Seña et al. found no association between CD4 count, HIV viral load or ART and serological treatment failure.
“Conversely, in a more recent meta-analysis, Seña et al. found no association between CD4 count, HIV viral load or ART and serological treatment failure.132”
From BASHH UK guidelines for the management of syphilis 2024 (2024) · cites this paper as [132]
The Results section (‘Factors associated with serological outcomes among HIV-infected persons with syphilis’; page not provided) says some studies found no association with CD4 count, HIV viral load, or ART. But it also reports studies linking lower CD4 count to serological failure and ART to a reduced failure rate, so the unqualified claim of no association overstates the review’s findings. (LLM, conf=0.90)
Experimental — accuracy not yet measuredSerologic response to treatment appears associated with age; titers among older patients might be less likely to decrease fourfold than those of younger patients.
“age (titers among older patients might be less likely to decrease fourfold than those of younger patients) (596–598).”
From Sexually Transmitted Infections Treatment Guidelines, 2021 (2021) · cites this paper as [597]
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- Authors
- Seña, A. C., Zhang, X.-H., Li, T., Zheng, H.-P., Yang, B., Yang, L.-G., Salazar, J. C., Cohen, M. S., Moody, M. A., Radolf, J. D., & Tucker, J. D.
- Affiliations
- University of North Carolina at Chapel Hill (US)
- University of Connecticut (US)
- Duke University (US)
- Corresponding author
- Seña, Arlene C.
- ORCID
- Venue
- BMC Infectious Diseases
- Published
- 2015-10-28
- Volume
- 15
- Issue
- 1
- Pages
- 479-479
- ISSN
- 1471-2334 (ISSN-L)
- PMC
- PMC4625448
- OpenAlex
- W1851308942
- Cited by
- 150
- References
- 77
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- 2026: 13 · 2025: 16 · 2024: 15 · 2023: 21 · 2022: 10 · 2021: 16 · 2020: 17 · 2019: 12 · 2018: 15 · 2017: 11 · 2016: 4
- FWCI
- 1.22
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- BMC Infectious Diseases (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
- Funders
- National Institutes of Health
- National Institute of Allergy and Infectious Diseases (R01AI26756, R01AI026756)
- Fogarty International Center (K01TW008200, D43TW009532)
- School of Medicine, University of North Carolina at Chapel Hill
- Topics
- Health Sciences › Medicine › Physiology › Syphilis Diagnosis and Treatment
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Historical Medical Research and Treatments
- Life Sciences › Immunology and Microbiology › Parasitology › Vector-borne infectious diseases
- Keywords
- syphilis, HIV coinfection, CD4 count, HIV viral load, syphilis stages, treatment failure
- MeSH terms
- Age Factors, Humans, Syphilis, Syphilis Serodiagnosis, HIV Infections, Treatment Outcome, Treatment Failure, CD4 Lymphocyte Count, Viral Load
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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