Could “challenging trials” accelerate the development of the coronavirus vaccine? – BBC News

Scientists have warned that there could be many months before a test against the coronavirus vaccine that is being tested is effective. One way to speed up the process would be if “challenge trials” are allowed, where volunteers are vaccinated and then intentionally infected with coronavirus to see if they are protected. But some experts are not convinced that such tests are safe or necessary. Fergus Walsh is our medical editor. Subscribe HERE .

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