This visualization compares chickenpox vaccination rates against case percentages for Bolivia, Chile, and Peru in 2020 using a bar chart. Each country’s vaccination percentage is displayed as a clickable bar, with the y-axis formatted to show percentages and gridlines for readability. Built with React and D3 v7, the code uses `scaleBand` and `scaleLinear` for positioning, `axisBottom` and `axisLeft` for axes, and React state to handle bar selection interactions. Data loads from an embedded CSV file.