Linköping University : A large medical Faculty that have a close connection to the County Council responsible for health care and the vaccination program in a large region in southeast Sweden (around 500.000 inhabitants). In this defined region (representative for Sweden). Besides, we also have access to national data of vaccination for COVID as well as other vaccination programs retrospectively. Also, policy programs on the national and regional level for vaccination over the years. This includes data of vaccination coverage and also data of public health aspects like how well priorities of risk groups, ages and social groups has been fullfilled. The Swedish team has for decades been involved in international research collaborations within project OTC_Sociomed and QUALICOPC within the EU 7 Frameprogram 2009-2012. but also participating in project funded outside EU like the EPOCH project supported by the Canadian Institute of Health.