As the U.S. attempts to ramp up COVID-19 vaccinations, the winter storm that swept across the nation disrupted the delivery and distribution of about 6,000,000 doses, said the White House on Friday.

The storm impacted vaccination in all 50 states as delivery services faced disruptions in road service and power availability, impacting three days' worth of shipments.

Dozens of states have had to postpone appointments because of the delays. 

As new COVID-19 cases and hospitalizations stay on the decline, experts warn it's still too early to lift restrictions.

The country is averaging more than 3,000 new cases daily.

The Pfizer-BioNTech vaccine is showing increased promise with two new developments this week.

An Israeli study showed the vaccine is highly effective after the first shot.

Research for the AstraZeneca vaccine shows similar results, which could give regulators the option of possibly delaying the second dose instead of following the strict vaccine regimen, the New York Times reports.

The U.S. is sticking to the three week gap between shots but the British government has decided to prioritize giving as many shots as possible in the first round. 

Although many countries have begun COVID-19 vaccinations, others have yet to receive their first shipments.

The G7 is promising to boost COVID-19 vaccine supply for developing countries by pledging $7.5 billion to the Covax global vaccine initiative.

Participating countries also agreed to share surplus vaccines.

The U.S. will make their donation after most Americans are vaccinated, according to a senior administration official, POLITICO reports.