Vaccination passports would add another digital layer to the multitude of existing coronavirus health and contact tracing apps many countries and U.S. states have rolled out. Their use domestically to reopen local economies has been hotly debated.
source https://www.seattletimes.com/nation-world/explainer-how-vaccine-passports-for-global-travel-will-work/?utm_source=RSS&utm_medium=Referral&utm_campaign=RSS_technology
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