MIT Technology Review December 14, 2020
Many states rolled out exposure notification services after covid transmissions started surging, but health experts say new apps can still help.
California’s exposure notification system launched statewide on December 10, which means that almost half of all Americans now live somewhere covered by an app that will warn them if they’ve been close to someone with covid-19.
We’re watching these rollouts closely as part of our Covid Tracing Tracker, which monitors the development of contact tracing apps in the US and around the world. These apps are now operating in 19 states, as well as in Washington, DC, Guam, and Puerto Rico. A handful of other states are either in a pilot period or have said they are considering using...
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