COVID-19 vaccine certificates are emerging as a key tool for reopening international travel. These certificates would verify that a person has been vaccinated, either via a physical card or a digital app, and could be required for entry into various countries. Governments and airlines are developing systems to facilitate this process, with countries like Greece, Denmark, and Portugal leading the way. While such certificates aim to ease travel restrictions, they also raise concerns about equity, particularly for those in nations with limited vaccine access. The debate includes balancing public health with potential discrimination and privacy issues.

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