ILINet Flu Surveillance Data Interactive Visualization
This interactive dashboard explores ILINet flu surveillance data from the CDC, showing weekly patient visit percentages across years, states, and regions. Four coordinated panels display temporal trends, a geographical choropleth map, and bar charts ranking state averages. Built with React and D3 v5, the visualization uses d3.scaleBand, d3.scaleLinear, d3.scaleOrdinal, and d3.geoAlbersUsa for rendering, with topojson providing US state boundaries. Users can filter by year and state through linked highlighting and selection, with color legends and tooltips supporting exploration.