When the Advisory Committee on Immunization Practices reconvenes, it could potentially vote to recommend that only people beyond a certain age receive the J&J vaccine.
AstraZeneca said results it published on Monday in which the vaccine had demonstrated 79% efficacy were based on an interim analysis of data through Feb. 17, and it would now "immediately engage" with the independent panel monitoring the trial to share its full analysis.
AstraZeneca will publish up-to-date results from its major US COVID-19 vaccine trial within 48 hours.
The administration also plans to invoke the Defence Production Act to boost supply of personal protective equipment, lab equipment and to maximize vaccine production.
"We might not see improvement until we're well into March as it will take time for our Covid response plan to begin to produce visible progress," Biden said.