What is contact tracing? - TechCrunch

What is contact tracing?  TechCrunchUS can learn from China, Singapore about using phones to track Covid-19 coronavirus  Vox.comApple and Google Announced a Coronavirus Tracking System. How Worried Should We Be?  Common DreamsGoogle and Apple will team up to track spread of COVID-19 with smartphone tech  KPRC Click2HoustonThe Business Case for Apple and Google’s Social Altruism  AdweekView Full Coverage on Google News