UK/ONS zur Covid-Impfung: von Dosis zu Dosis immer weniger Schutz vor Infektion Zuletzt aktualisiert: 11. Mai 2022 Coronavirus (COVID-19) latest insights - Office for National Statistics https://www.ons.gov.uk/peoplepopulationandcommunity/healthandsocialcare/conditionsanddiseases/articles/coronaviruscovid19latestinsights/vaccines
