What do we know about the COVID-19 (coronavirus) vaccine?

Unchallenged

The EU has agreed to buy up to 300 million doses of the BioNTech-Pfizer coronavirus vaccine

The EU has agreed to buy up to 300 million doses of the vaccine, but has refused to provide details on how the vaccine would be rolled out, insisting that "a number of steps" needed to be followed beforehand.

Sources