An elderly couple try to register through the website in order to have a chance to get the Covid-19 vaccine, but even though they have tried repeatedly to enter their data on the web platform unfortunately they have not been able to register because it has failures and is not available on February 3, 2021 in Mexico City, Mexico
Ricardo Castelan Cruz / Eyepix Group/Barcroft Media via Getty Images
About 16% of US adults are digitally illiterate — yet signing up for the vaccine requires navigating multiple web pages.
Implementation of 'vaccine passports' could be similarly problematic since not everyone has a smartphone.
Privacy concerns about data linked to the verification QR codes need to be addressed before implementation.