https://www.news-medical.net/news/20220929/Primary-vaccinations-and-boosters-effective-in-reducing-COVID-19-severity-during-Delta-and-Omicron-predominance.aspx
In a new study, researchers analyzed COVID-19 vaccination and surveillance data to understand the effect of primary vaccinations, boosters, and prior SARS-CoV-2 infections on severe COVID-19 outcomes and subsequent infections.
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