A volunteer in Moderna's vaccine clinical trial receives a shot. Photo: Paul Hennessy/NurPhoto via Getty Images

The U.S. government has agreed to buy 100 million doses of Moderna's experimental coronavirus vaccine for $1.5 billion, or $15 per dose.

Why it matters: The Trump administration, through Operation Warp Speed, has now bought initial batches of vaccines from Moderna, GlaxoSmithKline and Sanofi, Pfizer, Novavax, Johnson & Johnson and AstraZeneca before knowing whether they are safe and effective. The federal government also appears to own some of the patent rights associated with Moderna's vaccine.

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Biden: "I trust vaccines, I trust scientists, but I don’t trust Donald Trump"

In remarks in Delaware on Wednesday, Joe Biden made clear that he trusts the scientists on a coronavirus vaccine but not President Trump, laying out a list of three criteria he wants the administration to meet to ensure the process is not politicized.

Why it matters: Republicans have been criticizing Biden and other Democrats as being anti-vaccine in the wake of recent comments about whether they’d take a vaccine approved by the Trump administration on an expedited timetable.

Sep 16, 2020 - Politics & Policy

Trump contradicts CDC chief on when vaccine will be widely available

President Trump claimed at a press briefing on Wednesday that CDC director Robert Redfield was wrong when he testified to Congress that a coronavirus vaccine won't be available for widespread distribution until the second or third quarter of 2021.

Why it matters: Trump has already faced criticism for allegations that his administration has politicized the coronavirus response and is seeking rapid approval and distribution of a vaccine in order to boost his re-election campaign.

Sep 16, 2020 - Health

CDC director suggests face masks offer more COVID-19 protection than vaccine would

CDC director Robert Redfield suggested in a Senate Appropriations subcommittee hearing on Wednesday that face masks are "more guaranteed" to protect against the coronavirus than a vaccine, citing the potential for some people to not become immune to the virus after receiving the shot.

What he's saying: "These face masks are the most important, powerful public health tool we have. And I will continue to appeal for all Americans, all individuals in our country, to embrace these face coverings. I've said if we did it for 6, 8, 10, 12 weeks, we'd bring this pandemic under control," he said.