Lastly, a small number of passengers carrying valid certificates still contracted smallpox because they were improperly vaccinated.
[3]: 21–24 Countries with required meningococcal vaccination for travellers include The Gambia, Indonesia, Lebanon, Libya, the Philippines, and most importantly and extensively Saudi Arabia for Muslims visiting or working in Mecca and Medina during the Hajj or Umrah pilgrimages.
"[9] Australian Prime Minister Scott Morrison subsequently announced that all international travellers who fly to Australia without proof of a COVID-19 vaccination will be required to quarantine at their own expense.
It was designed as an international standard by the World Economic Forum and The Commons Project, and set up in such a way that it could also be used to record vaccination results in the future.
It standardises test results and aims to prevent forgery of vaccination records, while storing only limited data on a passenger's phone to safeguard their privacy.
The Danish College of General Practitioners also welcomed the project, saying that it doesn't force anyone to vaccinate, but encourages them to do so if they want to enjoy certain privileges in society.
Coveney stressed that "We do not want, following enormous efforts and sacrifices from people, to reintroduce the virus again through international travel, which is a danger if it is not managed right.
The mobile app standardizes the health verification process confirming whether passengers have been vaccinated against, or tested negative for, COVID-19 prior to travel.
Passengers will use the app to create a digital passport linked to their e-passport, receive test results and vaccination details from laboratories, and share that information with airlines and authorities.
The application is intended to replace the existing paper-based method of providing proof of vaccination in international travel, colloquially known as the Yellow Card.