The US has promised to share doses of the Pfizer, Moderna and Johnson & Johnson vaccines with other countries.
Some of the doses will be shared via the Covax initiative while doses will also be sent directly to countries.
Of the 55-million doses, 41-million will be sent to Covax.
At least 14-million doses will be sent to Latin American countries and the Caribbean, while 16-million will be sent to Asia and 10-million to Africa.