BERLIN (AP) — The World Health Organization said Sunday that a U.N.-backed program shipping coronavirus vaccines to many poor countries has now delivered 1 billion doses, but that milestone “is only a reminder of the work that remains” after hoarding and stockpiling in rich countries.

A shipment of 1.1 million COVID-19 vaccine doses to Rwanda on Saturday included the billionth dose supplied via the COVAX program, the U.N. health agency said.