Article 2 COVID-19 2 Humans 2 SARS-CoV-2 2 Vaccination 2 coronavirus disease 2019 2 human 2 immunity 2 susceptible exposed infectious recovered model vaccination 2 virus transmission 2 Austria 1 Bayesian analysis 1 Bayesian inference 1 Belgium 1 COVID-19 testing 1 Cross-country comparison 1 Healthcare system 1 Immunity, Herd 1 Luxembourg 1 Luxembourg [Belgium] 1 Markov Chain Monte Carlo 1 Markov chain 1 Markov chain Monte Carlo method 1 Monte Carlo analysis 1 Nursing Homes 1 Pandemics 1 SARS-CoV-2 vaccine 1 SEIR model 1 Skilled Nursing Facilities 1