Several EU countries are receiving significantly fewer doses of the Pfizer coronavirus vaccine than expected, after the US firm slowed shipments, APA reports citing BBC.
Six nations called the situation "unacceptable" and warned it "decreases the credibility of the vaccination process".
Sweden, Denmark, Finland, Lithuania, Latvia and Estonia urged the EU to apply pressure on Pfizer-BioNTech.
Pfizer said the reduced deliveries were a temporary issue.
In a statement on Friday, the drugmaker said shipments were being affected by changes to its manufacturing processes designed to boost production.
"Although this will temporarily impact shipments in late January to early February, it will provide a significant increase in doses available for patients in late February and March," Pfizer said.
The company said its production upgrades would also have a "short-term impact" on the delivery of vaccines to the UK.
Despite this, the UK government said it still planned to hit its target of vaccinating all priority groups by mid-February - about 15 million people.
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