https://www.refinery29.com/en-us/2020/04/9744147/what-is-immunity-passport-covid-19
As the effort to test coronavirus survivors for antibodies continues, officials are warning against the concept of "immunity passports." Here's what that means.
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https://www.thejakartapost.com/news/2020/05/20/estonia-starts-testing-digital-immunity-passport-for-workplaces.html
Estonia starts testing digital immunity passport for workplaces - World - The Jakarta Post
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