Cleared for takeoff? World eyes 'health passports'

From digital certificates to “health passports”, countries and airlines across the globe are hoping to relaunch travel by letting people prove their Covid-free status. But with patchy vaccine access around the world and mounting concerns over data privacy, questions are swirling about how the measures will work in practice. There’s an app for that?Most programmes under development are geared towards facilitating travel and come in the form of smartphone apps with varying criteria for a clean bill of health. Vaccine passports, for example, are a popular way to approach proof of immunity with ja…

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