Frequent testing of highly sexually active gay men is required to control syphilis.
Abstract
BACKGROUND: The incidence of syphilis infections has been substantially increasing in gay men in the developed world. METHODS: We developed an individual-based mathematical model describing syphilis transmission within a gay male population: we used the model to simulate the expected relative impact of numerous screening and treatment interventions, targeting different at-risk groups with various coverage and frequency rates and follow-up schedules. RESULTS: The model predicts that increasing the proportion of gay men tested each year would have a relatively modest impact on syphilis incidence. However, increasing the frequency of testing can have a large impact, with the prevalence of syphilis reduced substantially if individuals are tested every 3 months. Targeting frequent screening at gay men who have large numbers of partners or who engage in group sex is a more efficient way of reducing syphilis epidemics. Contact tracing the regular partners of infected individuals is the most efficient intervention and can have a significant epidemiological impact with relatively high coverage rates. CONCLUSIONS: Increasing the frequency of testing and treatment are required to mitigate syphilis epidemics. Notifying and testing partners of infected men should occur where possible but the high rates required to reverse epidemic trends are likely to be infeasible. Contact tracing should be a secondary priority that is coupled with increases in the frequency of testing in the population. Encouraging testing among men not previously tested for syphilis is also recommended.
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Models from Australia have demonstrated that increasing syphilis screening frequency from two times a year to four times a year resulted in a relative decrease of 84% from peak prevalence.
“Models from Australia have demonstrated that increasing syphilis screening frequency from two times a year to four times a year resulted in a relative decrease of 84% from peak prevalence (224).”
From Sexually Transmitted Infections Treatment Guidelines, 2021 (2021) · cites this paper as [224]
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- Authors
- Gray, R. T., Hoare, A., Prestage, G. P., Donovan, B., Kaldor, J. M., & Wilson, D. P.
- Affiliations
- UNSW Sydney (AU)
- Sydney Hospital (AU)
- Corresponding author
- Gray, Richard T.
- Hoare, Alexander
- Prestage, Garrett P.
- Donovan, Basil
- Kaldor, John M.
- Wilson, David P.
- Venue
- Sexually Transmitted Diseases
- Published
- 2010-05
- Volume
- 37
- Issue
- 5
- Pages
- 298-305
- ISSN
- 0148-5717 (ISSN-L)
- OpenAlex
- W2038246485
- Cited by
- 99
- References
- 42
- Citations by year
- 2026: 5 · 2025: 7 · 2024: 3 · 2023: 2 · 2022: 5 · 2021: 4 · 2020: 4 · 2019: 10 · 2018: 4 · 2017: 8 · 2016: 6 · 2015: 10 · 2014: 5 · 2013: 10 · 2012: 6
- FWCI
- 8.29
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Sexually Transmitted Diseases (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Mathematical and Theoretical Epidemiology and Ecology Models
- Health Sciences › Medicine › Physiology › Syphilis Diagnosis and Treatment
- Social Sciences › General Social Sciences › HIV, TB, and STIs Epidemiology
- Keywords
- syphilis, gay men, syphilis transmission, mathematical model, contact tracing, partner notification, sexually transmitted infections, HIV prevention, men who have sex with men, group sex, sexual risk behavior
- MeSH terms
- Australia, Disease Outbreaks, Humans, Male, Mass Screening, Population Surveillance, Sexual Partners, Syphilis, Models, Statistical, Contact Tracing, Homosexuality, Male, Disease Transmission, Infectious, Unsafe Sex
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