April 26 (UPI) -- The United States will release AstraZeneca COVID-19 vaccine doses to other countries, official said Monday.
Andy Slavitt, White House senior adviser for COVID-19 response, made the announcement on Twitter.
"U.S. to release 60 million AstraZeneca doses to other countries as they become available," Slavitt tweeted.
The announcement comes amid mounting pressure from lawmakers and experts since the United States has millions of doses of AstraZeneca vaccine that is authorized in other countries, such as India, where the COVID-19 crisis is worsening. The vaccine is not yet authorized for use in the United States.
U.S. Rep. Raja Krishnamoorthi, D-Ill., called on President Joe Biden's administration "to release millions of AstraZeneca doses to countries hardest hit by the spread of COVID-19, including India, Argentina, and potentially others," in a statement Thursday.
A day later, U.S. Rep. Ro Khanna, D-Calif., praised the administration's assistance to India amid shortages of oxygen due to COVID-19 surge in the country, including personal protective equipment, and oxygen generation supplies, and urged the administration to also release AstraZeneca vaccines to India.
On Saturday, Brown University School of Public Health Dean Ashish Jha also urged the Biden administration to send AstraZeneca doses to India in an op-Ed in The Washington Post.
Slavitt responded to some of the criticism in the Twitter post Monday.
"To everyone who understandably says: 'about time' or 'what were they waiting for,' at this time there are still very few available. No real time has been lost," Slavitt tweeted.
White House Press Secretary Jen Psaki said at a news conference Monday the AstraZeneca doses cannot be released immediately since they have to undergo Food and Drug Administration safety reviews, but she expects "in the coming weeks," about 10 million doses will be available upon the FDA clearance.
Fifty million additional doses are in "various stages of production" and may be available in May and June, Psaki added.