‘Vaccine passports’ are on the way, but developing them won’t be easy

The Biden administration and private companies are working to develop a standard way of handling credentials — often referred to as “vaccine passports” — that would allow Americans to prove they have been vaccinated against the novel coronavirus as businesses try to reopen.

The effort has gained momentum amid President Biden’s pledge that the nation will start to regain normalcy this summer and with a growing number of companies — from cruise lines to sports teams — saying they will require proof of vaccination before opening their doors again.

The...