Scientists say trials of a new Coronoavirus vaccine being developed at Oxford University are "extremely promising".
Initial results showed the injection led to patients making antibodies and also T-Cells - those are the white blood cells which can destroy the virus.
And larger trials have already started using it.
The Health Secretary Matt Hancock said it brings us "one step closer" to a working vaccine, which could save lives here and all round the world.
But we're still some way off knowing whether it'll offer enough protection.
Here's our Correspondent Rachel Younger on the new vaccine and how it works.
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