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ILINet Flu Surveillance Data
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Description
This visualization uses a multi-line chart to show annual ILI total flu cases in the US from 2015 to 2019, enabling year-over-year comparison—revealing the 2018 peak and the extended 2019 season. Ordered color encoding on the year field makes newer years darker for readability. Built with Vega-Lite API via `vl.markLine`, it aggregates data by year, region, and week, using `vl.sum('ILITOTAL')`. The data originates from CDC FluView, loaded as CSV through `d3.csv`.
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