On 11 January 2020, media from what would come to be known as Sars-CoV-2 , or Covid -19.
Scientists were able to develop the vaccine quickly since this vaccine technology has been around for decades.
By then, cases were spreading rapidly worldwide.
The same day, Chinese virologist Zhang Yongzhen published the genome sequence of the virus online.
At this point, researchers are not sure which part of the vaccine is causing an immune response against a platelet factor involved in this reaction.
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