Four months after Apple and Google announced an unusual collaboration to help public-health authorities track the novel coronavirus, apps built on their privacy-optimized Exposure Notification framework have begun arriving in the U.S.

The first, Virginia’s COVIDWISE, debuted Aug. 5. North Dakota and Wyoming shipped their Care19 Alert Aug. 13, Alabama launched its GuideSafe app Aug. 17, and Nevada introduced COVID Trace on Monday. The University of Arizona is testing Covid Watch Arizona, with a statewide release expected soon.

They work by sharing anonymous Bluetooth beacons with nearby devices running the same software, tagging those that suggest extended and close contact associated with coronavirus spread, and saving the last 14 days of these records.

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以前一直不懂为什么有的图看不了，后来才发现是自己的权限不够，所以要多发帖回帖，增加积分，才能看更多的图，这个绝对不是坑大家的，所以大家要多回帖啊，顺便把我的回一回吧，谢谢啦，随便顶一下就行

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