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Screening for Syphilis in Nonpregnant Adolescents and Adults

Systematic Review to Update the 2004 U.S. Preventive Services Task Force Recommendation

Evidence Syntheses, No. 136

Investigators: , MD, MPH, , MD, MPH, , BA, and , MA.

Author Information and Affiliations
Rockville (MD): Agency for Healthcare Research and Quality (US); .
Report No.: 14-05213-EF-1

Structured Abstract

Background:

In 2004, the U.S. Preventive Services Task Force recommended routine screening for syphilis infection in asymptomatic persons at increased risk of infection, and recommended against screening in those not at increased risk.

Purpose:

To update a prior systematic review on screening for syphilis infection in asymptomatic, nonpregnant adolescents and adults for the U.S. Preventive Services Task Force.

Data Sources:

Cochrane Central Register of Controlled Trials (to March 2016) and Cochrane Database of Systematic Reviews (to March 2016), MEDLINE (January 2004 to March 2016), and reference lists.

Study Selection:

English-language trials and observational studies of screening effectiveness, test accuracy, and screening harms.

Data Extraction:

One investigator abstracted details about study design, patient population, setting, screening method, followup, and results. Two investigators independently applied prespecified criteria to rate study quality. Discrepancies were resolved through consensus.

Data Synthesis:

Four observational studies conducted outside the United States evaluated detection rates using specific screening intervals among men who have sex with men (MSM) or persons living with HIV. Higher rates of detection were reported for early syphilis in MSM living with HIV (8.1% vs. 3.1%; p=0.001), newly acquired syphilis in MSM living with HIV (7.3 cases [95% CI, 5.2 to 9.9] vs. 2.8 cases [95% CI, 1.8 to 4.0] per 1,000 patient-years; p<0.05); early latent syphilis in MSM (1.7% vs. 0.4%; p=0.008); and early syphilis in higher-risk MSM (53% vs. 16%; p=0.001) when screening every 3 months compared with 6 or 12 months. Three diagnostic accuracy studies found that treponemal or nontreponemal tests are accurate screening tests for syphilis in asymptomatic persons (sensitivity >85% and specificity >91% for nontreponemal and treponemal tests in most studies) but require confirmatory testing. Two studies of the accuracy of reverse sequence testing indicated that using an automated treponemal test for initial screening resulted in a higher rate of false-reactive tests compared with using the Rapid Plasma Reagin test as an initial test in a low prevalence U.S. population (0.6% vs. 0.0%; p=0.03) and a higher prevalence Canadian population (0.26% vs. 0.13%), but both methods also identified additional positive tests that would not have been identified using conventional methods.

Limitations:

No studies addressed the effectiveness of screening, the effectiveness of risk assessment instruments, or the adverse effects of screening. No studies were specifically conducted in adolescents. Only screening tests and methods cleared by the U.S. Food and Drug Administration for current clinical practice were included to determine diagnostic accuracy.

Conclusions:

Observational data from four studies demonstrate improved detection of syphilis infection among MSM or men living with HIV who are screened every 3 months compared with 6 or 12 months. Screening with treponemal or nontreponemal tests is accurate for detecting syphilis in asymptomatic persons but requires confirmatory testing. Further research is needed to understand the impact of screening for syphilis on clinical outcomes; effective screening strategies, including reverse sequence screening, in various patient populations; and harms of screening.

Contents

Acknowledgements: The authors acknowledge Andrew Hamilton, MLS, MS, for conducting literature searches and Spencer Dandy, BS, for assistance with drafting this report at the Oregon Health & Science University. The authors also thank AHRQ Medical Officers Tina Fan, MD, MPH, and Tess Miller, DrPH, as well as current and former members of the U.S. Preventive Services Task Force who contributed to topic deliberations.

Prepared for: Agency for Healthcare Research and Quality, U.S. Department of Health and Human Services1. Contract No. HHSA-290-2012-00015-I, Task Order No. 4. Prepared by: Pacific Northwest Evidence-Based Practice Center2

Suggested citation:

Cantor A, Nelson HD, Daeges M, Pappas M. Screening for Syphilis in Nonpregnant Adolescents and Adults: Systematic Review to Update the 2004 U.S. Preventive Services Task Force Recommendation. Evidence Synthesis No. 136. AHRQ Publication No. 14-05213-EF-1. Rockville, MD: Agency for Healthcare Research and Quality; 2016.

This report is based on research conducted by the Pacific Northwest Evidence-based Practice Center (EPC) under contract to the Agency for Healthcare Research and Quality (AHRQ), Rockville, MD (Contract No. HHSA-290-2012-00015-I). The investigators involved have declared no conflicts of interest with objectively conducting this research. The findings and conclusions in this document are those of the author(s), who are responsible for its content, and do not necessarily represent the views of AHRQ. No statement in this report should be construed as an official position of AHRQ or of the U.S. Department of Health and Human Services.

The information in this report is intended to help health care decisionmakers—patients and clinicians, health system leaders, and policymakers, among others—make well-informed decisions and thereby improve the quality of health care services. This report is not intended to be a substitute for the application of clinical judgment. Anyone who makes decisions concerning the provision of clinical care should consider this report in the same way as any medical reference and in conjunction with all other pertinent information (i.e., in the context of available resources and circumstances presented by individual patients).

The final report may be used, in whole or in part, as the basis for the development of clinical practice guidelines and other quality enhancement tools, or as a basis for reimbursement and coverage policies. AHRQ or U.S. Department of Health and Human Services endorsement of such derivative products may not be stated or implied.

None of the investigators has any affiliations or financial involvement that conflicts with the material presented in this report.

1

5600 Fishers Lane, Rockville, MD 20857; www​.ahrq.gov

2

Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239; www​.ohsu.edu/epc

Bookshelf ID: NBK368467PMID: 27336106

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