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14 lip 2021 · Based on what we know so far, vaccines are proving effective against existing variants, especially at preventing severe disease, hospitalization and death. However, some variants are having a slight impact on the ability of vaccines to guard against mild disease and infection.
9 sie 2021 · Vaccine efficacy is usually expressed as a percentage, but what is it actually measuring? Statisticians explain what the numbers mean, and what they say about how well a vaccine can protect us.
4 mar 2021 · All of the authorized and approved vaccines are effective at preventing severe COVID-19. Against earlier forms of the coronavirus, the vaccines were highly effective at preventing...
18 lis 2022 · To estimate waning protection from vaccination, we systematically compiled 20 studies from nine countries that estimated vaccine efficacy as a function of time since the second dose. In addition, to date we have found 10 studies covering six countries for the Omicron variant and eight studies covering six countries for booster doses.
While COVID-19 vaccines are highly effective against serious disease and death, no vaccine is 100% effective. Vaccinated people can get infected and may fall ill with COVID-19. This is known as a ‘breakthrough infection’ or ‘breakthrough case’.
2 mar 2022 · In this study, we estimated vaccine effectiveness against symptomatic disease caused by the delta and omicron variants after two doses (primary immunization) of BNT162b2, mRNA-1273, or ChAdOx1...
5 mar 2022 · Studies of the duration of protection of COVID-19 vaccine effectiveness indicate that vaccine effectiveness decreases more against infection and symptomatic disease than against severe disease in the 6 months after full vaccination.
