This visualization shows the global prevalence of HIV/AIDS in 2017, with countries colored on a choropleth map using a yellow-to-red sequential scale. The map uses an Equal Earth projection rendered as SVG, with graticules and interior borders. Built with React and D3 v7, the code loads TopoJSON world atlas data and CSV data, then uses d3.geoPath to draw the map and d3.scaleSequential with d3.interpolateYlOrRd to encode prevalence values. Countries without data appear in grey.