HIV and Syphilis Co-Infection Dynamics
Summary
The interplay between human immunodeficiency virus (HIV) and syphilis represents a paradigm of reciprocal facilitation in which each pathogen influences acquisition, transmissibility and disease progression of the other. Syphilis lesions breach mucosal barriers and recruit activated CD4+ T cells to sites of Treponema pallidum infection, enhancing the efficiency of HIV transmission. Conversely, HIV-induced immunodeficiency impairs serological responses to syphilis and may alter natural history, leading to atypical presentations or accelerated progression. At a population level, overlapping sexual networks, behavioural risks and gaps in routine screening have driven recurrent outbreaks among men who have sex with men and other marginalised groups. Co-infection amplifies onward transmission, complicates clinical management and places additional demands on public health infrastructure. Effective control requires integrated surveillance, regular dual screening, prompt treatment and tailored behavioural interventions. Advances in molecular diagnostics, mathematical modelling and implementation research are beginning to inform optimal screening intervals, targeted outreach and resource allocation. As global efforts strive to curb sexually transmitted infections and end AIDS, understanding the complex dynamics of HIV and syphilis co-infection remains a cornerstone of combined prevention and care strategies.
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HIV and Syphilis Co-Infection Dynamics publication trend
The graph below shows the total number of articles in hiv and syphilis co-infection dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
Co-infection: Simultaneous infection by two or more pathogens in the same host, leading to interactive effects on pathogenesis and transmission.
Incidence: The rate at which new cases of a disease occur in a defined population over a specified period.
Prevalence: The proportion of individuals in a population who have a particular disease at a given point in time.
Seroconversion: The period during which specific antibodies develop and become detectable in the blood following infection.
Latent syphilis: A stage of syphilis infection characterised by serological evidence of Treponema pallidum without clinical signs or symptoms.
Viral load: The quantity of HIV RNA in the blood, reflecting the intensity of viral replication and infectiousness.
References
- Temporal Trends in Syphilis Incidence among Men with HIV in Busan, Korea, 2005–2022: A Retrospective Cohort Study. Viruses (2024).
- Prevalence of syphilis among men who have sex with men: a global systematic review and meta-analysis from 2000–20. The Lancet Global Health (2021).
- Syphilis Predicts HIV Incidence Among Men and Transgender Women Who Have Sex With Men in a Preexposure Prophylaxis Trial. Clinical Infectious Diseases (2014).
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