{"version":"1.0","type":"rich","title":"Fork of Fork of ILINet Flu Surveillance Data","description":"This chart shows national ILI (influenza-like illness) totals across weeks for each year from 2015 to 2019, using overlaid line marks to compare seasonal patterns. It highlights which years peaked earlier or later, and which had higher overall case counts. The visualization is built with the Vega-Lite API and D3, using `vl.markLine` and an aggregated sum of `ILITOTAL` grouped by year, region, and week. Color encodes the year as a nominal field, though this unordered mapping makes it harder to infer chronological order. Data originates from CDC FluView via a CSV fetched with `d3.csv`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"","width":960,"height":500,"cache_age":3600}