Rae Ellen Bichell

People Proving to Be Weakest Link for Apps Tracking COVID Exposure

Contact tracers in many states are stretched thin. Colorado is among the latest states to launch an app that aims to help, based on the COVID contact-tracing tool built by Apple and Google. But there’s a chicken-and-egg problem: More people will use them if they prove to work, but the apps become effective only if more people use them.