Some 70% of the U.S. population of 330 million would need to be inoculated to achieve “herd” immunity from the virus, a goal the country could achieve by May, according to Dr. Moncef Slaoui, chief scientific adviser for “Operation Warp Speed.”

“The COVID-19 pandemic and its unprecedented impact in terms of lives lost, livelihoods and economies affected, is an unparalleled shock that has revealed vulnerabilities in our preparedness and response and underscored our common challenges,” the final communique said.

G20 nations will work to “protect lives, provide support with a special focus on the most vulnerable, and put our economies back on a path to restoring growth, and protecting and creating jobs for all”.

On vaccines, tests and treatments, the leaders said: “We will spare no effort to ensure their affordable and equitable access for all people.”

Citing government sources, it said British regulators were about to start a formal appraisal of the vaccine, made by Pfizer Inc and BioNTech SE, and that the National Health Service had been told to be ready to administer it by Dec. 1.

The U.S. Food and Drug Administration said on Friday that it would meet on Dec. 10 to discuss whether to authorise the vaccine.

“Our vaccine therefore costs about the same as a flu shot, which is between $10 and $50,” he was quoted as saying.