Mathematical pitfall plagues antibody tests
Even if a screening test is very accurate, if it is not 100% perfect then it will deliver some false positives and some false negatives. And the lower the infection rate, the more likely it is that a positive result is wrong. An imperfect antibody test for COVID-19, for example, could leave a lot of people thinking that they are possibly immune to the disease, when they have never even had it. Scientific American explains, with a very handy graphic, how this mind-bending fact arises.
Scientific American | 3 min read
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