Tedros Adhanom Ghebreyesus has said it was not fair for younger, healthy people in richer nations to get injections before vulnerable people in poorer nations.
He said that a "me-first" approach to the crucial vaccine would be self-defeating because it would push up prices and encourage hoarding.
He said: "I need to be blunt - the world is on the brink of a catastrophic moral failure.
"Ultimately, these actions will only prolong the pandemic, the restrictions needed to contain it, and human and economic suffering."
He said that over 39 million vaccine doses had been given in 49 richer states - but one particular nation had only 25 doses.
He also called on countries of the world to ensure that by 7 April, Covid vaccines are being administered in every country.
"My challenge to all member states is to ensure that by the time World Health Day arrives on 7 April, Covid-19 vaccines are being administered in every country, as a symbol of hope for overcoming both the pandemic and the inequalities that lie at the root of so many global health challenges."
https://twitter.com/Channel4News/status/1351163080361832448?s=20
In Ireland, Stephen Donnelly is today expected to ask the Cabinet to approve an agreement which will allow doctors and pharmacists to administer Covid-19 vaccines.
