We present a model for HIV-related behaviors that emphasizes the dynamic and social nature of the structural factors that influence HIV prevention and detection. Key structural dimensions of the model include resources, science and technology, formal social control, informal social influences and control, social interconnectedness, and settings. These six dimensions can be conceptualized on macro, meso, and micro levels. Given the inherent complexity of structural factors and their interrelatedness, HIV prevention interventions may focus on different levels and dimensions. We employ a systems perspective to describe the interconnected and dynamic processes of change among social systems and their components. The topics of HIV testing and safer injection facilities are analyzed using this structural framework. Finally, we discuss methodological issues in the development and evaluation of structural interventions for HIV prevention and detection.
KeywordsHIV; AIDS; structural factors; diagnosis; prevention Structural interventions have had a profound impact on public health. Even a casual observer of history can see the connection between structural changes such as water purification or highway safety and reductions in morbidity and mortality. Structural interventions can have a tremendous effect on individual-level health behaviors as well. Legislative changes such as regulating tobacco sales and usage have led individuals to modify their health behaviors and dramatically reduced smoking rates. 1Although structural approaches to health promotion are clearly effective, they are often viewed as outside the purview of behavioral interventionists. Prevailing conceptions of "cause" as immediate and necessary antecedents of health outcomes consider factors that affect outcomes in more indirect and indefinite ways as less important or less relevant. 2,3 Structural factors have also been neglected because researchers in the field of HIV prevention are often unprepared to develop and evaluate strategies to change laws, social organizations, or physical structures. Moreover, because of the scope and focus of structural interventions, randomized controlled trials, the gold standard to evaluate interventions'
Each year, the US AIDS Drug Assistance Program provides access to prescription drugs—including antiretrovirals—to more than 110,000 persons living with HIV (PLWH) who lack adequate medical insurance. PLWH on effective antiretroviral therapy live longer lives, with enhanced quality of life, and are less likely to transmit HIV to others. There are thus significant benefits associated with the ADAP program. But there also are substantial costs. A mathematical model was used to assess the cost-effectiveness of the US ADAP program. Findings indicate that by providing antiretrovirals to underinsured persons, the ADAP program prevented 3191 secondary infections and saved 24,922 quality-adjusted life years in 2008. The net cost per quality-adjusted life year saved was $11,955, which suggests that the ADAP program is cost-effective by conventional standards.
Persons living with HIV infection are encouraged to disclose their HIV-positive serostatus to prospective sex partners to decrease the likelihood of unsafe sex and HIV transmission. However, the effectiveness of serostatus disclosure as a preventive measure is not known. We developed a mathematical framework for assessing the HIV transmission risk reduction effectiveness of serostatus disclosure, examined how increasing the disclosure rate affects the transmission risk reduction effectiveness of disclosure, and explored the interaction between condom use and disclosure effectiveness. Under base-case assumptions, serostatus disclosure reduced the risk of HIV transmission by between 17.9% and 40.6% relative to no disclosure. Increasing the disclosure rate from the base-case value of 51.9-75.7% produced a 26.2-59.2% reduction in risk. The findings of this modeling study strongly support intervention efforts to increase both serostatus disclosure and condom use by persons living with HIV.
Twenty-three U.S. states currently have laws that make it a crime for persons who have HIV to engage in various sexual behaviors without, in most cases, disclosing their HIV-positive status to prospective sex partners. As structural interventions aimed at reducing new HIV infections, the laws ideally should complement the HIV prevention efforts of public health professionals. Unfortunately, they do not. This article demonstrates how HIV disclosure laws disregard or discount the effectiveness of universal precautions and safer sex, criminalize activities that are central to harm reduction efforts, and offer, as an implicit alternative to risk reduction and safer sex, a disclosure-based HIV transmission prevention strategy that undermines public health efforts. The article also describes how criminal HIV disclosure laws may work against the efforts of public health leaders to reduce stigmatizing attitudes toward persons living with HIV.
Criminializing nondisclosure of HIV serostatus does not reduce sexual risk behavior. Although the laws do not appear to increase stigma, they are also not likely to reduce HIV transmission.
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