The World Health Organization (WHO) has criticised the rollout of coronavirus vaccines in Europe as being "unacceptably slow".
It also says the situation in the region is more worrying than it has been for several months.
Vaccination campaigns in much of Europe have been hit by delays and the number of infections is rising.
France is the latest country to announce new lockdown measures, lasting four weeks.
"Vaccines present our best way out of this pandemic... However, the rollout of these vaccines is unacceptably slow" and is prolonging the pandemic in the wider Europe region, WHO director for Europe Hans Kluge said in a statement.
"We must speed up the process by ramping up manufacturing, reducing barriers to administering vaccines, and using every single vial we have in stock, now," he added.
In the meantime, as long as vaccine coverage remained low, he said EU countries would have to impose lockdowns and other measures to compensate for the delays.
Mr Kluge also warned that the vaccine rollout, despite its slow speed, risked "providing a false sense of security to authorities and the public alike".
