A comparative analysis of COVID-19 vaccination certificates in 12 countries/regions around the world: Rationalising health policies for international travel and domestic social activities during the pandemic.

As the unprecedented pandemic of COVID-19 became a major barrier during the past two years, many countries were using the "COVID pass" or COVID-19 vaccination certificates in attempts to facilitate effective international travel and domestic social activities. The difficulty remained in how the "COVID pass" from different countries and regions could be mutually recognised. This study surveys the current practice of COVID-19 vaccination certificates in 12 representative countries/regions around the world and provides a comprehensive mapping of the vaccination certificates in these countries/regions. The study compares and contrasts the vaccination certificates in both format and content, including their primary purposes, international accreditation, naming conventions, recipients' personal information, and the details on vaccines and vaccination. The findings are interpreted in light of implementation practices in each country/region and discussed in relation to their various functions, as well as legal, technical, and ethical considerations. Based on the analysis and discussion recommendations are made on the practice of vaccination certificates in attempts to facilitate effective international travel and domestic social activities.