https://www.siliconvalley.com/2020/04/28/watch-californias-shrinking-covid-19-outbreak-thanks-to-instagram-founders/

A month ago, as COVID-19 was spreading through California, every 10 infected residents were spreading the virus to 13 others. Now, that number has fallen to fewer than nine — a rate that, if sustained, leads to extinction, say experts.

Our rate of new infections aren’t zero, which is where we need to be. But the epidemic has gone from expanding to shrinking, reflecting hard-won gains against the virus, according to a major new Silicon Valley-built website called Rt.live.