https://www.theguardian.com/world/2020/apr/06/when-will-coronavirus-vaccine-be-ready

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This unprecedented speed is thanks in large part to early Chinese efforts to sequence the genetic material of Sars-CoV-2, the virus that causes Covid-19. China shared that sequence in early January, allowing research groups around the world to grow the live virus and study how it invades human cells and makes people sick.