WASHINGTON, July 3, 2020 (Xinhua) -- Francis Collins, director of the U.S. National Institutes of Health (NIH), testifies during a hearing of U.S. Senate Subcommittee on Labor, Health and Human Services, Education, and Related Agencies on the plan to research, manufacture and distribute a coronavirus vaccine on Capitol Hill in Washington, D.C., the United States, on July 2, 2020.