![]() ![]() Even now, travelers from certain regions are required to show a version of the card at airports.īut 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. In the 1960s, amid yellow fever epidemics, the World Health Organization introduced an international travel document, known informally as the yellow card. In the 1880s, in response to smallpox outbreaks, some public schools began requiring students and teachers to show vaccination cards. Among all the tools that health agencies have developed over the years to fight epidemics, at least one has remained a constant for more than a century: paper vaccination certificates.
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