At a briefing for a select group of media, a senior United States administration official said early Tuesday there are "no AstraZeneca doses that have completed and cleared that process to be sent to other countries".
More than three million people worldwide have died of COVID-19, including more than 572,000 in the U.S.
AstraZeneca's vaccine, unlike those of Pfizer, Moderna and Johnson & Johnson, has also not been granted emergency use authorization by the Food and Drug Administration.
The United States will start to share up to 60 million doses of AstraZeneca's vaccine with other countries as soon as the next few weeks, the White House said.
"Right now we have zero doses available of AstraZeneca", Psaki said, noting that USA regulators still need to review the quality of those already produced. Ventilators, therapeutics, rapid testing kits and personal protective equipment will be sent as well, the White House said.
No final decisions have been made on which countries will receive the AstraZeneca doses, a senior administration official said.
But only 30 million doses were delivered in the first quarter of 2021.
Asked if India put it a request for these vaccines to be sent over, the senior official replied in the negative.
In a separate press conference on Tuesday, President Joe Biden said he has discussed with Prime Minister Nareem Modi about sending shots to the country.
About 10 million doses of AstraZeneca vaccine had been produced but were yet to pass review by the FDA to "meet its expectations for product quality", Mr Zients said, noting the regulator was recognized as the "gold standard" for safety around the world.
The Associated Press earlier on Monday reported the doses would be shared in coming months following their clearance by the FDA.
The European Union filed a lawsuit against AstraZeneca Plc, raising the stakes in the spat between the drugmaker and the bloc's 27 governments over vaccine deliveries.
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It all comes as Democrats are digging in to try to defend their narrow House majority in the off-year elections in 2022. Langevin, a Democrat who has built up 20 years of seniority after becoming the first quadriplegic to serve in Congress.
"Just to be clear, right now, we have zero doses available of AstraZeneca", Psaki told reporters. "So, this is not immediate".
"But the scale of the response should match the scale of the crisis, and we call on the administration to do more".
A spokesman for AstraZeneca said the company can't comment on specifics but said the doses were part of AstraZeneca's supply commitments to the US government, and decisions to send supply to other countries would be made by USA officials.
India's government has chose to leave the import of COVID-19 vaccines to state authorities and companies, two government officials told Reuters, a decision that may slow acquisitions of shots.
'We should be diverting vaccine stock to India now, ' wrote Dr Adam Gaffney, an assistant professor at Harvard Medical School tweeted. Some of those doses have already been sent to Mexico and Canada as part of what the U.S. has referred to as a "loan". The vaccine is awaiting Food and Drug Administration (FDA) authorisation, and the United States has already signed a deal for 300 billion doses. She said the deal will ensure doses for booster shots, vaccines adapted to new variants, and, potentially, vaccines for children and teenagers.
Political concerns have also weighed on officials, who are wary of sending doses overseas before every American can access them.
The US is in a comfortable position with 200 million - or almost two-thirds of its population - having received at least one dose of a vaccine.
Biden said in March that if there was a surplus of vaccines, "we're going to share it with the rest of the world".
We are sending actual mechanical parts that are needed for the machinery they have to build a vaccine, ' he said.
Under the Defence Production Act invoked by former President Donald Trump to meet the Covid-19 crisis, raw materials were contracted by the government, which then supplied them to vaccine manufacturers to enable them to meet their commitments to the USA government.
Other countries like Russian Federation and China - regimes where the political downside of sending vaccines overseas have little bearing on leaders' decision-making - have far outpaced the USA in distributing vaccines, expanding their influence in places like Southeast Asia.
The EU has been furious at the low levels of COVID-19 vaccines delivered by AstraZeneca so far.