LOUISVILLE, KY - MARCH 04: A box containing vials of the Janssen COVID-19 vaccine sit on a counter before being transported to a refrigeration unit at Louisville Metro Health and Wellness headquarters on March 4, 2021 in Louisville, Kentucky. The FDA approved the third COVID-19 vaccine Saturday. Unlike the Moderna and Pfizer/BioNTech COVID-19 vaccines, the Johnson &amp; Johnson vaccine will be administered in one dose. The U.S. government will manage allocation and distribution of the vaccine in the U.S.   Jon Cherry/Getty Images/AFP (Photo by Jon Cherry / GETTY IMAGES NORTH AMERICA / Getty Images via AFP)