This interactive visualization shows quarterly HIV new-case counts across 50 districts, displayed as a multi-line chart with overlaid circle markers. Users filter districts through a React-Select multi-select dropdown, which updates a Vega-Lite layer combining line and point marks. The code builds charts programmatically via the vega-lite-api, using `vl.markLine()`, `vl.markCircle()`, and `vl.filter()` to apply district selections from component state. Data loads asynchronously from a CSV using `d3.csv`, and the rendered SVG is injected into the DOM through React’s `dangerouslySetInnerHTML`.