Abstract
Antibody serosurveillance is an essential tool for monitoring the COVID-19 pandemic, offering a more comprehensive picture of who has been infected than swab testing of symptomatic individuals alone. In recent months, several countries have done large-scale seroprevalence surveys, including the USA,1,2 China,3 Brazil,4 England,5 and Spain.6 These studies have confirmed that the world is still in the early stages of the COVID-19 pandemic, with the majority of the populations surveyed testing negative for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibodies.
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