This interactive visualization explores ILINet flu surveillance data across US states, years, and weeks. It integrates a choropleth map, a bar chart ranking top states, and a line chart showing trends over time, all linked through brushing and hovering. Built with React and D3 v5, it uses `geoAlbersUsa` projection for the map, `scaleBand` and `scaleLinear` for the bar and line axes, and `scaleOrdinal` for color encoding. The map’s sequential color scale uses `interpolateYlOrRd`, with a custom color legend and tooltips providing state-specific values.