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  2. What does a faint line on a rapid COVID-19 test mean? - AOL

    www.aol.com/faint-line-covid-19-test-225851470.html

    However, people who've had COVID-19 may continue to test positive on PCR tests for up to 90 days, so it may be difficult to use a PCR test to diagnose a new coronavirus infection.

  3. COVID-19 rapid antigen test - Wikipedia

    en.wikipedia.org/wiki/COVID-19_rapid_antigen_test

    Screening all students every two days with a "low-sensitivity, high-specificity test" (such as a RAT) would be able to control an outbreak of COVID-19. [12] Mina et al theorized that higher-frequency screening using lower-sensitivity RATs may be more useful than lower-frequency screening using higher-sensitivity PCR tests because the former ...

  4. Why the UK was dumb to use Microsoft Excel to count ... - AOL

    www.aol.com/why-uk-dumb-microsoft-excel...

    Not only does it lead to underestimating the scale of coronavirus in the UK, but perhaps more important is the subsequent delay in entering the details of positive cases into the NHS Test and ...

  5. Rapid antigen test - Wikipedia

    en.wikipedia.org/wiki/Rapid_antigen_test

    A COVID-19 Rapid Antigen test(top) with a Covid-19 Rapid Antigen and a Influenza A&B Rapid Antigen Test(bottom) A rapid antigen test (RAT), sometimes called a rapid antigen detection test (RADT), antigen rapid test (ART), or loosely just a rapid test, is a rapid diagnostic test suitable for point-of-care testing that directly detects the presence or absence of an antigen.

  6. What Really Causes a False Positive COVID-19 Test? Experts ...

    www.aol.com/false-positive-covid-19-test...

    You can also check the U.S. Department of Health and Human Services’ Community-Based Testing Sites for COVID-19 website to find testing locations, health centers, pharmacies, and other resources ...

  7. Numeric precision in Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Numeric_precision_in...

    Excel's storage of numbers in binary format also affects its accuracy. [3] To illustrate, the lower figure tabulates the simple addition 1 + x − 1 for several values of x. All the values of x begin at the 15 th decimal, so Excel must take them into account. Before calculating the sum 1 + x, Excel first approximates x as a binary number

  8. Development of COVID-19 tests - Wikipedia

    en.wikipedia.org/wiki/Development_of_COVID-19_tests

    The development of COVID-19 tests was a major public health priority during the early months of the COVID-19 pandemic. In January 2020, scientists from China published the first genetic sequences of SARS-CoV-2 via virological.org, [3] a "hub for prepublication data designed to assist with public health activities and research". [4]

  9. Got COVID? Here are the new 2024 isolation guidelines

    www.aol.com/finance/got-covid-2024-isolation...

    Two lines appear on the test card, 15 minutes after you’ve swabbed the depths of your nostrils and swirled the contents in a plastic tube.You’ve got COVID.. As recently as February, a positive ...