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What we know so far about mixing Covid-19 vaccines

https://qz.com/india/2046596/what-we-know-so-far-about-mixing-covid-19-vaccines/
Studies are underway for mixing Pfizer’s mRNA shot with AstraZeneca’s viral vector vaccine.In May, 20 people in India’s Uttar Pradesh were accidentally administered doses of Covaxin after they took Covishield.