WASHINGTON, D.C.: The US will donate 75 percent of its unused Covid-19 vaccines to the United Nations-backed Covax global vaccine sharing program, President Joe Biden announced Thursday as more Americans have been vaccinated and global inequities have become more glaring.

The White House unveiled the allocation for sharing a first 25 million doses with the world, part of its plans to share 80 million globally by the end of June. The administration says 25 percent will be kept in reserve for emergencies and for the US to share directly with allies and partners.