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並前往https://www.reuters.com/business/healthcare-pharmaceuticals/british-study-shows-covid-19-vaccine-efficacy-wanes-under-delta-2021-08-18/

British study shows COVID-19 vaccine efficacy wanes under ...

The decline in efficacy was more pronounced among those aged 35 years and older than those below that age. "Both of these vaccines, at two doses ...

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