What defines an efficacious COVID-19 vaccine? A review of the challenges assessing the clinical efficacy of vaccines against SARS-CoV-2 – The Lancet

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The novel coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2),has caused more than 1 million deaths in the first 6 months of the pandemic and hugeeconomic and social upheaval internationally. An efficacious vaccine is essentialto prev…

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