The European Union will be able to produce enough vaccines to achieve its target for immunity of its adult population by the middle of July, the EU executive's vaccine task force chief said in an interview with a Greek newspaper.

"We are confident that we will be able to produce a sufficient number of vaccines to achieve the goal of collective immunity, which means that 70 per cent of the adult population would have been vaccinated by mid-July," European Internal Market Commissioner Thierry Breton said in an interview with Greek weekly newspaper To Vima.

Breton said that more than 400 million doses were expected to be delivered in the second quarter. "Member states need to be ready to speed up vaccinations."