The deal is the first contract signed by Europe's Inclusive Vaccines Alliance (IVA), a group formed by France, Germany, Italy and the Netherlands to secure vaccine doses for all member states as soon as possible.
At a meeting of EU Health Ministers on Friday, IVA agreed to merge its activities with those of the EU Commission, Germany's Health Ministry said.
"With our European supply chain due to begin production soon, we hope to make the vaccine available widely and rapidly," AstraZeneca
Chief Executive Pascal Soriot said in a statement.
The deal is the latest by AstraZeneca
to pledge supply of its vaccine to governments who have scrambled to agree on advance purchases of promising coronavirus
It has agreed manufacturing deals globally to meet its target of producing 2 billion doses of the vaccine, including two ventures backed by Bill Gates and a $1.2 billion agreement with the US government.
The deal will add a further 100 million doses to the 2 billion already committed by the group, an AstroZeneca spokesman said.
The experimentation phase of the vaccine is already advanced and is expected to end in the autumn, Italian Health Minister Roberto Speranza said in a Facebook post.
There are no approved vaccines or treatments for Covid-19, the highly contagious respiratory illness caused by the novel coronavirus.
"Many countries in the world have already secured vaccines, Europe has not yet. The rapid coordinated action of a group of member states will create added value for all EU citizens in this crisis," Spahn said.