COVID vaccine

A Truman Medical Center pharmacist prepares the first Pfizer-BioNTech vaccine for an ICU nurse in December 2020.

UN General Assembly Vaccine Pleas
FILE - In this March 16, 2020, file photo, Neal Browning receives a shot at the Kaiser Permanente Washington Health Research Institute in Seattle, in the first-stage safety study clinical trial of a potential vaccine for COVID-19, the disease caused by the coronavirus. Many world leaders at this week's virtual U.N. summit hope it will be a vaccine made available and affordable to all countries, rich and poor. But with the U.S., China and Russia opting out of a collaborative effort to develop and distribute a vaccine, and some rich nations striking deals with pharmaceutical companies to secure millions of potential doses, the U.N. pleas are plentiful but likely in vain. (AP Photo/Ted S. Warren, File)
Virus Outbreak Vaccine
FILE - In this Wednesday, June 24, 2020 file photo, a volunteer receives an injection at the Chris Hani Baragwanath hospital in Soweto, Johannesburg, as part of Africa's first participation in a COVID-19 vaccine trial developed at the University of Oxford in Britain in conjunction with the pharmaceutical company AstraZeneca. On Friday, Oct. 23, 2020, AstraZeneca Inc. announced that the Food and Drug Administration is letting it resume testing of its COVID-19 vaccine candidate in the U.S. (Siphiwe Sibeko/Pool via AP)
Virus Outbreak Britain Challenge Trial
FILE - In this Wednesday, Aug. 5, 2020 file photo, senior Clinical Research Nurse Ajithkumar Sukumaran prepares the COVID-19 vaccine to administer to a volunteer, at a clinic in London. U.K. researchers said Tuesday Oct. 20, 2020, they are preparing to begin a controversial experiment that will infect healthy volunteers with the new coronavirus to study the disease in hopes of speeding up development of a vaccine. (AP Photo/Kirsty Wigglesworth, File)