According to a study published by US health authorities, the effectiveness of the booster dose of vaccines from Pfizer and Moderna declines over time, but remains high against hospitalizations four months after injection.
The study was conducted between late August 2021 and January 2022, covering both waves related to the Delta and Omicron variants.
During both periods, the efficacy measured after a third dose was always higher than after two doses.
Efficacy against the Omicron variant rose to 91% for those who received their third dose within two months, but fell to 78% for people who received it four months or more ago.
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