Hier kann sich jeder sein eigenes Bild von machen...es scheint einen stetigen Verlust der Impfwirkung zu geben...die in einigen Altergruppen in England wohl schon ins negative gedreht ist.
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A Vaccine efficacy of 50% means that doubly vaxxed people are 50% more protected from Covid than unvaxxed people. It means that the delta case rate in the vaxxed is half the delta case rate in the unvaxxed.
A Vaccine efficacy of -50% means that unvaxxed people are 50% more protected from Covid than doubly vaxxed people. It means that the delta case rate in the vaxxed is double the delta case rate in the unvaxxed.
A Vaccine efficacy of 0% means that doubly vaccinated people are 0% more protected from Covid than unvaxxed people. It means that the delta case rate in the vaxxed equals the delta case rate in the unvaxxed. It means the vaccines have lost all their effectiveness.
