As more than 100 million Americans have received Covid-19 vaccines, experts are calling on the federal government to set standards for vaccination "passports" that may serve as proof.
원문출처 : https://www.cnn.com/2021/04/06/health/vaccine-passport-immunization-registry-data/index.html
원문출처 : https://www.cnn.com/2021/04/06/health/vaccine-passport-immunization-registry-data/index.html