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Speed coronavirus vaccine testing by deliberately infecting volunteers? Not so fast, some scientists warn

As desperately as the world wants a shot that provides protection from the new coronavirus afflicting one country after another, proving that a vaccine works safely can be painfully slow. Clinical trials start with small numbers of people and at first only look for side effects and immune responses, slowly building up to a large study that tests efficacy—a process that will take at least 1 year for the new virus. But as the scale of the pandemic becomes clearer, a provocative, ethically complicated proposal to shave many months off that timeline is gaining traction: Give people an experimental vaccine and then deliberately try to infect them.  Read more.....

 

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