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Covid-19 vaccine development
Greetings.

I am certain of having read on the internet in a science or medical journal of Covid-19 vaccine development greatly assisted by vaccine research on SARS-CoV, the coronavirus responsible for an outbreak in 2002-04. This virus is almost identical to SARS-CoV-2, hence early vaccine research on SARS-CoV would be of use in vaccine development of Covid-19. This, and not information in the article, is perhaps the real reason for very fast vaccine development for SARS-CoV-2.

Regards, Kent Walter