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How to beat Coronavirus with a mobile app that will show who is healthy

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What technology could we use to beat Coronavirus? What can we learn from the mobile app that Singapore built to beat coronavirus by targeting those with the disease rather than shutting down their whole economy with shelter-at-home orders? How will people have the confidence to go into public spaces now and two years from now without being exposed to life threatening contagious diseases?  Most people are healthy most of the time, but only a few are contagious. The "Am I Healthy?" mobile app provides a way to determine who is healthy and for public places to efficiently gate entry to only healthy persons. This would prevent sickness while also allowing the economy to thrive. Restaurants, airlines, sports arenas, trains, music and sports events, etc, currently face a problem of customer confidence. Customers will not return until they can have some assurance that they are not at risk when entering these spaces. I propose that users would show their "Am I healthy?"