In this Tuesday, June 22, 2021 file photo, healthcare workers prepare to test patients for COVID-19 at the Lancet Laboratories in Johannesburg. Africa is facing a devastating resurgence of COVID-19 infections whose peak will surpass that of earlier waves as the continent's countries struggle to vaccinate even a small percentage of the population, top health officials said Thursday June 24, 2021. (Photo by Denis Farrell/AP Photo/File)
