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WS61436bbaa310e0e3a68221f1
https://www.chinadaily.com.cn/a/202109/17/WS61436bbaa310e0e3a68221f1.html
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Pfizer and Moderna say COVID-19 vaccines wane over time
By Brian Chang
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chinadaily.com.cn
Updated: 2021-09-17 00:07
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On Wednesday, Pfizer and Moderna said the efficacy of their COVID-19 vaccines wane over time.
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