https://www.news-medical.net/news/20221006/The-immune-responses-and-safety-of-fractional-third-doses-of-heterologous-COVID-19-vaccines-after-CoronaVac-primary-series.aspx
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Researchers evaluated the vaccine effectiveness of half-doses of AZD1222 or BNT162b2 COVID-19 vaccines as a booster dose following primary series vaccination with CoronaVac.
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