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A vaccine which can prevent nine out of 10 people getting Covid-19 is set to be put forward for emergency approval.

Its developers, Pfizer and BioNTech, said it had been tested on 43,500 people, with no safety concerns raised.

What is the new vaccine and how effective is it?

The vaccine trains the immune system to fight coronavirus.

It is a new type of vaccine called an RNA vaccine and uses a tiny fragment of the virus’ genetic code. This starts making part of the virus inside the body, which the immune system recognises as foreign and starts to attack.