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What Can We Learn From Measles? No New HIV Infections
1University of California San Diego and Veterans Affairs San Diego Healthcare System, La Jolla, CA, USA.
Abstract:
Reducing the incidence of HIV infection until there are no new infections depends on driving the number of secondary infections produced by a typical source infection in a completely susceptible population (basic reproduction number; R0) down to less than 1. Components of R0 that must be addressed are the number of sexual contacts the infectious person makes per unit of time (C), the probability of transmission per single sexual contact with the infectious person (P), and the duration that the infected person is infectious to others (D) (R0 = C × P × D). Numerous strategies may contribute to driving transmission of HIV infection down to zero, including early initiation of antiretroviral treatment and pre- or postexposure prophylaxis. This article summarizes a presentation by Davey M. Smith, MD, at the IAS-USA continuing education program held in San Francisco, California, in March 2015.
Insights
To end new HIV infections, the basic reproduction number (R0) must be reduced below 1. Strategies like early antiretroviral treatment and prophylaxis are key to decreasing HIV transmission.
Area of Science:
- Public Health
- Infectious Disease Epidemiology
- HIV Prevention
Background:
- Achieving zero new HIV infections requires reducing the basic reproduction number (R0) to less than 1.
- The basic reproduction number (R0) is a product of transmission rate (C), probability of transmission (P), and infectious duration (D) (R0 = C × P × D).
Purpose of the Study:
- To summarize strategies for reducing HIV transmission to zero.
- To discuss the components of the basic reproduction number (R0) relevant to HIV transmission.
Main Methods:
- Summary of a presentation by Davey M. Smith, MD.
- Discussion of factors influencing HIV transmission (C, P, D).
Main Results:
- Multiple strategies can contribute to reducing HIV transmission.
- Early antiretroviral treatment and prophylaxis are highlighted as key interventions.
Conclusions:
- Reducing R0 below 1 is essential for eliminating new HIV infections.
- Comprehensive strategies, including treatment and prophylaxis, are necessary for HIV prevention.
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