With the resumption of global travel on the horizon, some people are discovering that their choice of vaccine could determine where they’re allowed to go.

Already, the European Union is planning to allow Americans vaccinated with shots approved by their drug agency to enter over the summer, European Commission president Ursula von der Leyen suggested in a New York Times interview Sunday.

This means that those who have shots by Chinese makers like Sinovac Biotech Ltd. and Sinopharm Group Co. Ltd. are likely to be barred from entry for the foreseeable future, with stark consequences for global business activity and the revival of international tourism.