"WHO does not currently recommend making such certificates mandatory," TASS quotes the director of the organization's emergency program, Michael Ryan.
Otherwise, countries that do not have access to vaccines will have limited opportunities to allow their citizens to travel, he said.
He noted that WHO intends to continue discussions on this issue in the future.
On January 28, the head of the WHO European division, Hans Kluge, spoke about the progress of the supply of vaccine against coronavirus to European countries.