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The Moderna and Pfizer-BioNTech vaccines are very effective in real-world conditions at preventing infections, the C.D.C. reported.
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![](https://static01.nyt.com/images/2021/03/29/us/29virus-briefing-cdc-vaccine1/merlin_184777584_fd8733b1-117e-426e-b53f-eadd3778dd92-mediumThreeByTwo440.jpg)
By Gina Kolata via NYT World https://ift.tt/3fsPOhR
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