Chile is so far the only country to launch an official immunitypassport scheme.
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Chile says the proposed document is not an " immunitypassport" but that those who have already been infected will be key to rebooting the economy.
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Germany is also looking into immunitypassports, which could also help end lockdowns.
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Companies are working seriously to develop immunitypassports.
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It warned against countries issuing so-called ' immunitypassports' to allow people who have recovered from Covid-19 to return to work or travel.
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Also read: Could a COVIDpassport be the answer for future travel?
Uso de immunity certificate en inglés
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They enable claimants to apply for secret hearings and ensure judges are satisfied that a public interest immunitycertificate could not be used instead.
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To stop the court releasing the documents, he issued three public interest immunitycertificates.
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Issue immunitycertificates in a trustworthy and interoperable manner.
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At present, so much evidence is subject to public interest immunitycertificates that the whole case can be gutted.
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Authorities had hoped antibody tests would allow them to issue so-called immunitycertificates to let people with defences against the disease return to work.
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German Chancellor Angela Merkel is planning on issuing immunitycertificates as researchers have begun testing 100,000 people a day for the disease.