A large number of poorer countries receiving vaccines through a global sharing scheme did not have enough doses to continue programmes, the World Health Organization added.
"As we continue to fight the Covid-19 pandemic at home and work to end the pandemic worldwide, President Biden has promised that the United States will be an arsenal of vaccines for the world", the White House said in a statement.
The White House also said, "In addition, the U.S.is committed to expanding local production of vaccines, and through our Quad partnership and the International Development Finance Corporation's support for vaccine manufacturing, more than 1 billion doses will be produced in Africa and India in 2021 and 2022".
The gap in vaccination rates between rich and poor countries is stark. It said it will release which specific vaccines are being shared and in what amounts later.
Of the 55 million remaining doses, some 41 million will be shared through COVAX, the White House said, with approximately 14 million going to Latin America and the Caribbean, some 16 million to Asia, and roughly 10 million to Africa.
Uganda, Zimbabwe, Bangladesh and Trinidad and Tobago are just some of the countries that have reported running out of vaccines in recent days.
"If we look at what we're hearing from countries on a day-to-day basis, well over half of countries have run out of stock and are calling for additional vaccine".
On Monday the administration of US President Joe Bidenannounced how it planned to donate 55 million vaccine doses to countries in need.
Philippine Ambassador to the United States Jose Manuel "Babe" Romualdez said the country could get Moderna or AstraZeneca vaccines from their surplus.
"The Biden-Harris administration is committed to working with USA vaccine manufacturers to produce more vaccine doses to share with the world", White House Press Secretary Jen Psaki said Monday.
The big picture: President Biden and G7 leaders have pledged to send 1 billion doses to the developing world, including 500 million from the US alone.
Some health experts believe it could be months - if not years - before enough people are vaccinated globally to declare an end to the pandemic.
The White House said it is still working through a variety of logistical and regulatory issues involved in shipping vaccine overseas, like safely transporting the doses and, at times, having to send related supplies, like syringes and alcohol pads, along with them.
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