r/worldnews - South Korea teen dies after testing negative for COVID-19 — Teenager in Daegu, South Korea, tested negative for the new strain of coronavirus but later tested positive in DNA tests. The high school student died due to "sudden pneumonia" after testing negative for coronavirus, local authorities said.

The rate at which a test correctly identifies whether or not a person has a disease (true positive) is called its sensitivity. No real world test has a sensitivity of 100%. For every group tested, there will always be a probability that some people with the disease test negative.

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