U.S. Senate Health, Education, Labor and Pensions Committee hearing held on Capitol Hill

U.S. National Institutes of Health (NIH) Director Francis Collins testifies before the U.S. Senate Health, Education, Labor and Pensions Committee during a hearing titled "Vaccines: Saving Lives, Ensuring Confidence, and Protecting Public Health" on Capitol Hill in Washington, D.C., the United States, on Sept. 9, 2020. (Greg Nash/Pool via Xinhua)