U.S. Vice President Kamala Harris receives a booster shot of the Moderna Covid-19 vaccine in the Eisenhower Executive Office Building in Washington, D.C., U.S., on Saturday, Sept. 30, 2021. A new study offers more evidence that Covid-19 vaccines provide stronger protection against hospitalization than immunity from an earlier infection, the U.S. Centers for Disease Control and Prevention said Friday.
Photo by Samuel Corum/UPI