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But exposure notifications only work if you and the people around you turn them on. Yes, you!
There’s early evidence this anonymous smartphone technology works — but so far isn’t helping very many Americans. In August, I wrote about the first of these state-sponsored alerts, Virginia’s Covidwise app. In the three months that followed, only 488 people have used the state’s app to send alerts about a positive diagnosis to others.
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This demonstration shows a close-contact alert from the Bluetooth coronavirus exposure notification app made by the Nevada Department of Health and Human Services. (Geoffrey Fowler/The Washington Post).
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James' World 2 
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