A former administration official involved with the vaccine effort told The Washington Post last month that plans for a digital system were underway, but that technical setbacks and time pressure forced them to rely instead on paper cards, which the CDC had reserved as a “fail-safe” option. Officials have also had to battle the increasingly politicized environment around so-called vaccine passports, which would be available through smartphone applications and allow users to prove they have been vaccinated.

Source: Washington Post May 07, 2021 03:11 UTC