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What is pooling and why is it helpful for COVID-19 testing?

Pooling can dramatically reduce the number of tests needed for a large group of people. This is done by splitting the large number of people into smaller subgroups, and then combining samples from all of those in a given subgroup into a single batch for testing. Members of a subgroup whose batch tests negative are all considered negative, while the members of any subgroups in a batch testing positive are re-tested individually to obtain results for each specific person. For more, read How to Test More People for Coronavirus Without Actually Needing More Tests.