This scatter plot shows how COVID-19 vaccination rates correlate with case counts in the United States, using data from Our World in Data. An interactive dropdown menu lets viewers switch between partially and fully vaccinated metrics, while the chart displays the proportion of the population vaccinated over time. The visualization uses D3 v6 with SVG rendering, employing `scaleTime` and `scaleLinear` for axes, `selection.join` for smooth transitions between data updates, and `d3-svg-annotation` to highlight the maximum vaccination percentage.