The World Health Organization (WHO) has criticised the EU's announcement of export controls on vaccines produced within the bloc, saying such measures risked prolonging the pandemic.
The EU introduced the measure amid a row with vaccine manufacturers over delivery shortfalls.
But WHO vice-head Mariangela Simao said it was a "very worrying trend".
Earlier WHO chief Dr. Tedros Adhanom Ghebreyesus said "vaccine nationalism" could lead to a "protracted recovery".
Speaking at the Davos Agenda - a virtual version of the global summit - he said vaccine hoarding would "keep the pandemic burning and... slow global economic recovery", in addition to being a "catastrophic moral failure" that could further widen global inequality.