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Topic: Efficacy Of Vaccines

An elderly man, a resident of the sprawling township of Alexandra in Johannesburg, opens his mouth to receive a testing swab for COVID-19 coronavirus at a screening and testing drive in front of the Madala Hostel, on April 27, 2020. (Photo by MARCO LONGARI / AFP) (MARCO LONGARI/AFP via Getty Images)

Does vaccine efficacy percentage matter?

Nicole Karlis