New York state is developing Excelsior Pass in partnership with IBM to provide digital proof of a COVID-19 vaccination. Chris Delmas/AFP via Getty Images hide caption
vaccine passport
New York State's Excelsior Pass is an app that people can use to show proof of vaccination or a negative COVID-19 test. NY Governor's Press Office via AP hide caption
The World Health Organization-approved proof of vaccination form is used these days for yellow fever. It's just a coincidence that the card itself is yellow. Michele Abercrombie/NPR hide caption
Some of our readers sent in their vaccine selfie pics. We asked the experts: What should they do with their vaccine cards? Photo collage by Michele Abercrombie/NPR hide caption