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"Distribution of Moderna vaccine has already begun," Perna said at a Saturday morning news briefing.

"Donald Trump has waved the white flag, abandoned our families and surrendered to this virus. But the American people never give up, never give in," Biden said, calling Trump's rally a "super-spreader event".

"Digitalization is changing commerce in a number of ways. We are seeing some businesses disappear or evolve over time, but at the same time the creation of new brands and types of operational modes are eliminating some traditional roles," said Sun Fuquan, a researcher at the Beijing-based Chinese Academy of Science and Technology for Development.

"Emerging technologies including unmanned delivery will be the core engine driving its businesses in the future," he added.

"Early results from tests in mice showed increased antibody production and had proven its safety," Yoshimura said, adding that it is possible to produce the DNA vaccine for 200,000 people by the end of this year.