Coronavirus vaccines will unlock global travel, but how will differing standards be managed?

By next year, millions of people around the world will be in line to be vaccinated against COVID-19.

It will be a landmark achievement for global science, which has managed to get several vaccine candidates developed in record time.

More countries announced this week they will roll out COVID-19 vaccines, joining the UK, Russia and China, which have already begun mass vaccination campaigns.

But with more vaccines comes more complexity for health administrators, as they will soon have to decide what to do with the vaccinated and non-vaccinated at the border.

Exactly what might happen is unclear, as vaccines have differing outcomes, and some shots may not stop those vaccinated from spreading the virus.

So in a world that is slowly due to…