This choropleth map visualizes the share of the population infected with HIV/AIDS for the year 2017, using a yellow-orange-red sequential color scale. Country boundaries and graticules are rendered as SVG paths via `d3.geoPath` and `geoNaturalEarth1`, with React managing the component structure. Data comes from an IHME CSV, joined to country geometries using ISO numeric codes. The visualization is a fork of a prior example, adapting city population data to HIV prevalence rates.