A health care worker holds a vial of the Johnson & Johnson COVID-19 vaccine at Klerksdorp Hospital in Klerksdorp, South Africa, on Feb. 18.

A healthcare worker holds a dose of the Johnson & Johnson vaccine against the COVID-19 coronavirus as South Africa proceeds with its inoculation campaign at the Klerksdorp Hospital on February 18, 2021. (Photo by Phill Magakoe / AFP) (Photo by PHILL MAGAKOE/AFP via Getty Images)