Study shows Covid-19 vaccination is associated with a smaller reduction in transmission of the delta variant compared with the alpha variant.
11 Jan, 2022 | 01:31h | UTC
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Vaccination was associated with a smaller reduction in transmission of the SARS-CoV-2 delta variant than of the alpha variant, and the effects of vaccination decreased over time. #COVID19 #IDTwitter https://t.co/giGzWSx31k pic.twitter.com/HlwBqNGFO1
— NEJM (@NEJM) January 5, 2022