This bar chart visualizes the distribution of diseases in 1968, showing the number of infections for each disease type. Built with D3 v6 and SVG, it uses `d3.scaleBand` for the categorical x-axis, `d3.scaleLinear` for the numeric y-axis, and `d3.axisBottom`/`d3.axisLeft` for axes. The dataset is loaded via `d3.csv` from a GitHub Gist URL. Interactive tooltips appear on mouseover, displaying infection counts, implemented with D3 selection and event handlers.