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How did we get Covid-19 vaccines so quickly
Most vaccines have been designed, tested, and manufactured for years, but with coronavirus, some pharmaceutical companies have to spend months with potential vaccines. (Subscribe:
The rapid speed has inevitably led some people to wonder if the corners have been cut. So how did we get vaccinated so quickly? And is it really safe? ——- See more of our explanatory series here – https://www.youtube.com/playlist?list=PLXjqQf1xYLQ6bu-iixvoFTVsiXQVlVniX
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