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Take precautions, test again 48 hours later, and if the second test is negative, take a third test 48 hours later. If you have no COVID symptoms without any known exposure , you probably don’t ...
If you test negative using an at-home test, repeat the test again in 48 hours. If you were exposed to COVID, test at least 5 full days after exposure. If you still test negative, wait 48 more ...
Here’s what Yahoo News medical contributor Dr. Lucy McBride advises if you’ve exposed to someone who tested positive for COVID-19, particularly for parents or guardians with school-age children.
Specificity indicates how well-targeted the test is to the virus in question. Highly specific tests pick up only the virus in question. Non-selective tests pick up other viruses as well. A 90% specific test will correctly identify 90% of those who are uninfected, leaving 10% with a false positive result. [13]
The risk of COVID‑19 infection increases especially in spaces where people engage in physical exertion or raise their voice (e.g., exercising, shouting, singing) as this increases exhalation of respiratory droplets. Prolonged exposure to these conditions, typically more than 15 minutes, leads to higher risk of infection. [233]
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Accuracy is measured in terms of specificity and selectivity. Test errors can be false positives (the test is positive, but the virus is not present) or false negatives, (the test is negative, but the virus is present). [179] In a study of over 900,000 rapid antigen tests, false positives were found to occur at a rate of 0.05% or 1 in 2000. [180]
Testing is a way to reduce the harm the virus causes and allow us to navigate the world in which COVID-19 is an ever-present threat.” Adriana Belmonte is a reporter and editor covering politics ...