University of Mississippi researchers have mapped a troubling reality across the American South: nearly 220 counties where HIV infection rates are climbing but prevention and care services remain scarce, leaving residents vulnerable to a disease that continues to spread unchecked. The team's "prevention gap index," published in Frontiers in Public Health, functions as a diagnostic tool for policymakers—a way to see not just where HIV is most prevalent, but where the gap between need and available resources is widest.
This distinction matters enormously in a region already carrying a disproportionate burden. The South accounts for nearly half of all new HIV diagnoses in the United States, despite being home to a smaller share of the nation's population. Mississippi itself ranks third in the nation for new HIV infection rates, trailing only Washington, D.C., and Georgia. Of the 1.2 million Americans currently living with HIV, roughly 13% don't yet know their status, according to the American HIV Epidemic Analysis Dashboard—a hidden epidemic that can accelerate transmission in communities with limited testing infrastructure.
Precious Edet, an instructional assistant professor of public health at Ole Miss, explains the research's driving question: "We wanted to better understand not just where HIV is most common, but where there is a mismatch between need and the availability of key prevention tools like HIV testing and antiretroviral pre-exposure prophylaxis." The team analyzed county-level data across the Southeastern U.S., examining both HIV prevalence and the presence of prevention and care resources to create a scorecard for each region. Of the 877 counties they mapped, 220 showed the same troubling pattern—high HIV rates paired with weak prevention systems.
What makes this finding especially urgent is the pattern of inequality it reveals. Counties with larger prevention gaps tend to have higher percentages of Black residents and lower income and education levels. These are not random geographical mismatches but reflections of deeper structural inequities—poverty, limited access to health care, stigma, and social disadvantage that have shaped the epidemic for decades. As Brandon Nabors, a postdoctoral research associate, notes: "In practical terms, residents may have to travel farther for services, experience delays in diagnosis or encounter gaps in ongoing care." When people lack timely access to HIV testing and treatment, the disease continues to spread, perpetuating cycles of poor health outcomes across generations.
The prevention gap index isn't meant to assign blame; rather, it's designed as a planning instrument. Public health leaders can use it to identify where resources are most urgently needed and allocate prevention education, testing, and treatment services accordingly. For Mississippi specifically, the research highlights the Mississippi Delta and other high-burden regions where HIV prevalence intersects with structural disadvantage—places where targeted investment in local prevention and care infrastructure could break the cycle.
"This reflects system-level challenges rather than individual behavior," Nabors emphasizes, underscoring that solutions must be structural, not moralistic. The research suggests that closing these gaps requires more than individual effort—it demands that policymakers direct resources toward communities that have been historically underserved, ensuring that geography and income no longer determine whether someone can access the tools needed to prevent infection or manage their health once diagnosed.