“This chart shows the daily number of new Covid-19 infections in each state over time. The y-axis is the population-normalized number of new infections per day; the x-axis is the rate of transmission (Rt). Each dot is a state or territory of the US, colored by region, and the area of the dot is proportional to the estimated number of new Covid-19 infections on that day.
https://observablehq.com/@chrisjkuch/covid-hotspots
I thought this was an interesting way to visualize the time series data.
cafebedouin.org 