New York Times: Vaccinated? Show Us Your App

New York Times: Vaccinated? Show Us Your App. “In the 1880s, in response to smallpox outbreaks, some public schools began requiring students and teachers to show vaccination cards. In the 1960s, amid yellow fever epidemics, the World Health Organization introduced an international travel document, known informally as the yellow card. Even now, travelers from certain regions are required to show a version of the card at airports. But now, just as the United States is preparing to distribute the first vaccines for the virus, the entry ticket to the nation’s reopening is set to come largely in the form of a digital health credential.”

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