Detection of Treponema pallidum DNA During Early Syphilis Stages in Peripheral Blood, Oropharynx, Ano-Rectum and Urine as a Proxy for Transmissibility
Clinical Infectious Diseases·
- DOI
- 10.1093/cid/ciac056
- PMID
- 35079776
- PMCID
- PMC9522397
- OpenAlex
- W4206916106
- Study type
- Journal article
- Publisher
- Oxford University Press (OUP)
- Article type
- journal-article
- Integrity
- current
Why this research matters now
The frequent detection of Treponema pallidum DNA in multiple anatomic sites even without visible lesions may help explain high syphilis transmission rates and suggests opportunities for earlier presymptomatic diagnosis. Detection in oropharyngeal and ano-rectal sites highlights potential transmission routes beyond classic presentations.
Structured evidence summary
Research question
The study evaluated whether Treponema pallidum DNA could be detected in peripheral blood, oropharyngeal swabs, ano-rectal swabs, and urine across different syphilis stages among men who have sex with men, to better understand transmissibility and potential diagnostic applications.
Study design
This was an observational study conducted at the Amsterdam Centre for Sexual Health from November 2018 to December 2019. Investigators used polymerase chain reaction targeting the polA gene to test for Treponema pallidum DNA in four sample types from adult MSM suspected of having syphilis, with staging defined by 2020 European guidelines.
Population and setting
The study enrolled 293 adult men who have sex with men at a sexual health center in Amsterdam who were suspected of having syphilis. Participants were distributed across primary (70), secondary (73), early latent (86), late latent (14), and treated syphilis (23), with 27 having no syphilis.
Main findings
Treponema pallidum DNA was found in at least one sample type in 50% of primary syphilis cases, 85% of secondary syphilis cases, and 34% of early latent syphilis cases. In secondary syphilis, detection rates were highest in oropharyngeal swabs (64%) and ano-rectal swabs (51%). No DNA was detected in late latent syphilis, treated syphilis, or individuals without syphilis.
Public-health relevance
The frequent detection of Treponema pallidum DNA in multiple anatomic sites even without visible lesions may help explain high syphilis transmission rates and suggests opportunities for earlier presymptomatic diagnosis. Detection in oropharyngeal and ano-rectal sites highlights potential transmission routes beyond classic presentations.
Important limitations
The abstract does not explicitly state study limitations. This summary is limited to the supplied single-article abstract and metadata and requires review of the original paper for decision-grade interpretation.
GIDS interpretation
This article was classified under syphilis diagnostics, transmission dynamics, and treatment topics. The PCR-based detection approach across multiple anatomic sites may support enhanced case finding in MSM populations and inform understanding of transmission pathways, particularly for asymptomatic and early-stage infections.
Related GIDS surveillance
Literature context does not validate, explain, or change a surveillance signal. Exact and contextual relationships are shown separately.
Evidence relationships
This article has 8 auditable classifier relationships to diseases, places, topics, and study design.