We provide here an updated analysis of primary COVID-19 vaccination and vaccine booster doses efficacy, emerging from the ongoing Italian nationwide COVID-19 vaccination campaign. Primary COVID-19 vaccination efficacy was 76-92% within 6 months, decreasing to 34-80% after 6 months. Administration of vaccine booster doses decreased SARS-CoV-2 infections by 65%, COVID-19 related hospitalizations and deaths by 69% and 97% compared to vaccine efficacy after 6 months, but also decreased SARS-CoV-2 infections by 39% compared to vaccine efficacy within 6 months. These results suggest that COVID-19 vaccine booster doses are important for restoring vaccine efficacy and further limiting virus circulation.
Primary COVID-19 vaccine cycle and booster doses efficacy: analysis of Italian nationwide vaccination campaign
Mattiuzzi, Camilla;Lippi, Giuseppe
2022-01-01
Abstract
We provide here an updated analysis of primary COVID-19 vaccination and vaccine booster doses efficacy, emerging from the ongoing Italian nationwide COVID-19 vaccination campaign. Primary COVID-19 vaccination efficacy was 76-92% within 6 months, decreasing to 34-80% after 6 months. Administration of vaccine booster doses decreased SARS-CoV-2 infections by 65%, COVID-19 related hospitalizations and deaths by 69% and 97% compared to vaccine efficacy after 6 months, but also decreased SARS-CoV-2 infections by 39% compared to vaccine efficacy within 6 months. These results suggest that COVID-19 vaccine booster doses are important for restoring vaccine efficacy and further limiting virus circulation.
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