[\'Italian National Institute of Health (ISS), Rome, Italy massimo.fabiani@iss.it.\', \'Italian National Institute of Health (ISS), Rome, Italy.\', \'Italian Ministry of Health, Rome, Italy.\']
Effectiveness of mRNA vaccines and waning of protection against SARS-CoV-2 infection and severe covid-19 during predominant circulation of the delta variant in Italy: retrospective cohort study.