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Friaaz Azeez gets tested for COVID-19 by a health-care worker at a pop-up testing centre at the Islamic Institute of Toronto in Scarborough, Ont., on May 29, 2020. THE CANADIAN PRESS/Nathan Denette

‘What do you mean, it was a false positive?’ Making sense of COVID-19 tests and terminology

Understanding terms like sensitivity and specificity can help us make sense of COVID-19 testing, the accuracy of tests and what the results mean.
Dana Gasby, left, interacts with her mother B. Smith in their East Hampton home on Long Island, New York, on Wednesday, January 9, 2019. B. Smith has Alzheimer’s Disease. Karten Moran for The Washington Post via Getty Images

The importance of blood tests for Alzheimer’s: 2 neuroscientists explain the recent findings

A blood test to detect Alzheimer's disease in people who have symptoms and even those who don't has been shown to work. Scientists still need to improve its accuracy rate to almost 100%, however.

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