People who get Covid-19 shots at thousands of Walmart and Sam’s Club stores may soon be able to verify their vaccination status at airports, schools and other locations using a health passport app on their smartphones.

The retail giant said on Wednesday that it had signed on to an international effort to provide standardized digital vaccination credentials to people. The company joins a push already backed by major health centers and tech companies including Microsoft, Oracle, Salesforce, Cerner, Epic Systems, the Mitre Corporation and the Mayo Clinic.

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