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