Americans got some good news on Wednesday morning when the White House announced that it had secured another 100 million doses of the Pfizer-BioNTech's COVID-19 vaccine.

Secretary of Health and Human Services Alex Azar released a statement afterward saying the U.S. will now have enough supply "to vaccinate every American who wants it by June 2021."

Even with these announcements questions remain on how exactly everyone will get vaccinated. States are having varying levels of success with the vaccine rollout process. Dr. Jose Romero, Arkansas health secretary and chair of the Centers for Disease Control and Prevention immunization advisory committee, discusses the success Arkansas has had with vaccine distribution and the lessons learned in the process.

In Seattle, NPR's Will Stone has been following vaccine distribution, including to health care workers who have been caring for COVID-19 patients for nearly a year.

One of the questions that remains as more people get vaccinated is should volunteers who got a placebo during the vaccine trials now be offered the real thing? NPR's Ari Shapiro speaks with Dr. Steven Goodman of Stanford School of Medicine who is advising the Food and Drug Administration about this.

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