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. 2022 Apr 1;32(2):328-330.
doi: 10.1093/eurpub/ckab220.

Primary COVID-19 vaccine cycle and booster doses efficacy: analysis of Italian nationwide vaccination campaign

Camilla Mattiuzzi  1 , Giuseppe Lippi  2
Affiliations

Primary COVID-19 vaccine cycle and booster doses efficacy: analysis of Italian nationwide vaccination campaign

Camilla Mattiuzzi et al. Eur J Public Health. .

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 with vaccine efficacy after 6 months, but also decreased SARS-CoV-2 infections by 39% compared with 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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