Antiretroviral Therapy and HIV Transmission Dynamics
Summary
Antiretroviral therapy (ART) has transformed HIV from a fatal illness into a manageable chronic condition and has become a cornerstone of global prevention efforts. By suppressing viral replication to undetectable levels, ART reduces the likelihood that a person living with HIV will transmit the virus to sexual partners or through vertical transmission. The concept of treatment-as-prevention (TasP) underpins this strategy, recognising that consistent adherence to ART not only confers individual health benefits but also delivers population-level reductions in incidence. The slogan “Undetectable = Untransmittable” (U = U) encapsulates robust evidence that sustained viral suppression eliminates sexual transmission risk. Despite this, ongoing transmission dynamics are shaped by factors such as gaps in diagnosis, suboptimal adherence, viral blips, behavioural disinhibition and co-existing sexually transmitted infections. Mathematical models project that universal testing and immediate initiation of ART could drive new infections towards zero, yet real-world constraints—stigma, health-system barriers and variable retention in care—limit the full realisation of TasP. Integrating ART delivery with prevention, education and community support remains essential to address residual transmission, emerging drug resistance and the global heterogeneity of epidemics.
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Antiretroviral Therapy and HIV Transmission Dynamics publication trend
The graph below shows the total number of articles in antiretroviral therapy and hiv transmission dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
Antiretroviral Therapy (ART): A combination of drugs that suppress HIV replication, maintain immune function and prevent disease progression.
Viral Suppression: The reduction of HIV RNA in blood to below detectable limits, typically defined as fewer than 50 copies per millilitre.
Treatment-as-Prevention (TasP): The strategy of using ART to achieve viral suppression in people living with HIV in order to prevent onward transmission.
Undetectable = Untransmittable (U = U): The principle that an individual with sustained viral suppression cannot sexually transmit HIV.
Secondary Transmission: The spread of HIV from one treated individual to another contact, often assessed through molecular network or epidemiological methods.
References
- The trend, prevalence and potential risk factors of secondary HIV transmission among HIV/AIDS individuals receiving ART in Guangxi, China: a longitudinal cross-sectional study. Emerging Microbes & Infections (2024).
- Knowledge of HIV transmission, prevention strategies and U = U among adult sexual and gender minorities in Brazil. Journal of the International AIDS Society (2024).
- Current syphilis infection in virally suppressed people living with HIV: a cross-sectional study in eastern China. Frontiers in Public Health (2024).
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