A group of 45 healthy, young volunteers in Seattle will be given the experimental jab.
Dr John Tregoning, an expert in infectious diseases at Imperial College London, UK, said:"This vaccine uses pre-existing technology.
"It's been made to a very high standard, using things that we know are safe to use in people and those taking part in the trial will be very closely monitored. "Yes, this is very fast - but it is a race against the virus, not against each other as scientists, and it's being done for the benefit of humanity."But the mRNA-1273 vaccine is not made from the virus that causes Covid-19.
Instead, it includes a short segment of genetic code copied from the virus that scientists have been able to make in a laboratory.Media playback is unsupported on your deviceThe volunteers will be given different doses of the experimental vaccine.But even if these initial safety tests go well, it could still take up to 18 months for any potential vaccine to become available for the public.
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