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並前往https://www.who.int/news/item/22-12-2021-interim-statement-on-booster-doses-for-covid-19-vaccination---update-22-december-2021

Interim statement on booster doses for COVID-19 vaccination

In adults above 50 years, vaccine effectiveness against severe disease decreased by about 10% (95% CI: 6 – 15%) over the same period.

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