A look at the SMART Health Card, a minimal verification system that uses QR codes to check COVID-19 vaccine status, available to ~200M people in the US (David Ingram/NBC News)

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David Ingram / NBC News:
A look at the SMART Health Card, a minimal verification system that uses QR codes to check COVID-19 vaccine status, available to ~200M people in the US  —  The SMART Health Card is voluntary and minimal by design to protect personal information.  About 80 percent of vaccinated people in the U.S. most likely have access to it.

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