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Medical News

The Effect of Changes in Condom Usage and Antiretroviral Treatment Coverage on Human Immunodeficiency Virus Incidence in South Africa: A Model-Based Analysis

February 2, 2012

The current study sought to assess trends in South Africa's HIV incidence and determine the extent to which prevention and treatment programs have reduced that incidence.

The researchers adapted two models of the South African HIV epidemic -- the STI-HIV Interaction model and the ASSA2003 AIDS and Demographic model. A Bayesian approach was used to fit both models to age-specific HIV prevalence data from antenatal clinic surveys and household surveys.

Both models suggest that HIV incidence in people ages 15-49 declined significantly from the beginning of 2000 to the start of 2008: by 27 percent (95 percent confidence interval: 21 percent-32 percent) in the STI-HIV model and by 31 percent (95 percent CI: 23 percent-39 percent) in the ASSA2003 model, when expressed as a percentage of incidence rates in 2000.

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