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. 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 jab rollouts underway across the globe. There are also apps that accept positive antibody tests as proof of immunity for those who have had the virus and recovered. But the WHO has warned that there is no evidence to show that recovered Covid sufferers with antibodies are protected from a second infection. French President Emmanuel Macron recently suggested yet another, more localised form of Covid-free permission slip: the so-called "health pass". Story has more.<br/>