Boxes containing vials of the Janssen COVID-19 vaccine sit in a container before being transported to a refrigeration unit at Louisville Metro Health and Wellness headquarters on March 4 in Louisville, Ky. The FDA approved the third COVID-19 vaccine on Feb. 27.

LOUISVILLE, KY – MARCH 04: Boxes containing vials of the Janssen COVID-19 vaccine sit in a container 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 & Johnson vaccine will be administered in one dose. The U.S. government will manage allocation and distribution of the vaccine in the U.S. (Photo by Jon Cherry/Getty Images)