These are up-to-date values for Rt, a key measure of how fast the virus is growing. It’s the average number of people who become infected by an infectious person. If Rt is above 1.0, the virus will spread quickly. When Rt is below 1.0, the virus will stop spreading.
The “Last Week” and “2 Weeks Ago” buttons clearly illustrate the effectiveness of our collective stay-at-home / stay-apart measures.
See also: This post at TechCrunch by Josh Constine, with backstory on the creation of and thinking behind the site.
★ Saturday, 18 April 2020