This visualization shows aggregated foodborne illness counts by month, with bars colored by the primary transmission mode of the outbreak. The chart uses a stacked bar chart where each month’s total illnesses are broken down by transmission category, and tooltips reveal the specific mode. Built with React, it loads data via D3’s `csv` method from a public dataset, then renders the chart using Vega-Lite’s API with a bar mark. The visualization filters out records with null primary modes and applies custom axis styling for readability.