The United States on Wednesday promised to buy 500 million more doses of COVID-19 vaccine to donate to other countries, as it comes under increasing pressure to share its supply with the rest of the world.

President Joe Biden made the announcement during a virtual summit aimed at boosting global vaccination rates against the coronavirus and rallying world leaders to do more.

"To beat the pandemic here we need to beat it everywhere," Biden said as he kicked off the summit, which included leaders from the U.K., Canada, Indonesia and South Africa, as well as World Health Organization head Tedros Adhanom Ghebreyesus.

"This is an all hands on deck crisis," Biden said of the pandemic that has raged since early 2020 and killed more than 4,900,000 people.

The additional vaccines will bring U.S. donations to more than 1.1 billion doses, far short of the 5 to 6 billion doses global health experts say is needed by poorer countries. Delivery of the new tranche will begin in January.

Health experts say rich countries have not done enough, and have criticized the United States in particular for planning booster shots for fully vaccinated Americans while much of the world's population still does not have access to vaccines.

They say the planned U.S. dose donations are welcome but insufficient, and note that the Pfizer vaccine is difficult to scale up and administer in poorer countries that lack sophisticated infrastructure for storing and shipping shots.

"We will need 6 to 9 billion doses of vaccines” to inoculate the developing world, said Peter Hotez, dean of the National Tropical School of Medicine at Baylor University in Texas.

"Donations alone aren’t enough to end this pandemic. The vast majority of lofty donation pledges haven’t materialized so far," said Carrie Teicher, director of programs for Doctors Without Borders.

Leaders from developing nations have warned that vaccine hoarding by wealthy countries could lead to new COVID-19 variants.

Biden said the United States would provide $370 million "to support administering these shots" and more than $380 million to help the Global Vaccine Alliance (GAVI) handle vaccine distribution in regions with the greatest need.

The vaccines from Pfizer Inc. and BioNTech SE will be made in the United States and shipped to low- and lower middle-income countries. A source familiar with the issue said the U.S. government would pay some $7 per dose.

With more than 670,000 people having died from COVID-19 in the United States, Biden has made clear that his priority has been to vaccinate Americans. But the spread of the delta variant of the coronavirus and outrage over imbalances in vaccine distribution has put pressure on Washington to do more.

"For every one shot we've administered to date in America, we have now committed to do three shots to the rest of the world," Biden said.

In June, the Biden administration agreed to buy and donate 500 million doses. Under the terms of that contract, the United States would pay Pfizer and BioNTech around $3.5 billion, or $7 a dose, for the shots.

The COVAX facility, backed by the World Health Organization and GAVI, has delivered more than 286 million COVID-19 vaccine doses to 141 countries, GAVI data shows. In September the organizations running the facility had to cut their 2021 delivery target by nearly 30%, to 1.425 billion doses.

Vaccination rates in some countries, including Haiti and the Democratic Republic of Congo, are less than 1%, a Reuters tracker shows.

United Nations Secretary-General Antonio Guterres reprimanded world leaders on Tuesday for the inequitable distribution of COVID-19 vaccines, describing it as an "obscenity" and giving the globe an "F in Ethics."

Delays in vaccinations mean the global population will be "exposed to new variants attacking us with greater ferocity," Colombian President Ivan Duque said Wednesday. "Global immunity requires solidarity, so hoarding cannot exist in the face of others' needs," Duque added.

The virtual summit also addressed the oxygen shortage, making medicines more available and preparing for a future pandemic. On vaccines, the Biden team is advocating a target of getting 70% of countries' populations vaccinated by this time next year.

Deliveries of the initial 500 million doses began in August, and the total 1 billion doses are expected to be delivered by the end of September 2022, according to a statement from Pfizer and BioNtech.

The doses will be made in Pfizer's U.S. facilities, and delivered to 92 low- and lower-middle income countries and the 55 member states of the African Union.

A consortium of pharmaceutical industry trade groups said in a statement Wednesday that global vaccine production was sufficient to provide boosters in rich countries and donations to the developing world in 2021.

Leaders from the Group of Seven major economies announced a plan in June to donate a billion doses of COVID-19 vaccine to poorer nations. That included the first 500 million tranche already pledged by the United States. The Biden White House wants other wealthy nations to donate more, too.

"Frankly, the rest of the world needs to step up and do more," White House spokeswoman Jen Psaki said.

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