![]() ![]() ![]() These vaccines are based on the mRNA vaccine platform and were developed by Pfizer/BioNTech and Moderna. In December 2020, the first two vaccines were approved by the FDA through emergency use authorization in the United States. ![]() This implies that at least 70-80 % of the population must achieve active immunity against the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), either as a result of a previous COVID-19 infection or by vaccination against SARS-CoV-2. With a death toll surpassing 500,000 in the United States alone, containing the pandemic is predicated on achieving herd immunity on a global scale. The novel coronavirus disease 2019 (COVID-19) has infected more than 100 million people globally within the first year of the pandemic.
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