Rijksinstituut voor Volksgezondheid en Milieu Protection of COVID-19 vaccination and previous infection against Omicron BA.1, BA.2 and Delta SARS-CoV-2 infections | RIVM Jaar: 2022 Protection of COVID-19 vaccination and previous infection against Omicron BA.1, BA.2 and Delta SARS-CoV-2 infections | RIVM Bron: rivm.nl Download dossier (ZIP) · JSON