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

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    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. You can still be contagious with COVID if you have a negative ...

    www.aol.com/news/still-contagious-covid-negative...

    If you have symptoms and test negative with an at-home rapid test, test again 48 hours later, the CDC advises. If you were exposed to COVID, do not have symptoms and test negative, test again 48 ...

  4. When should you test for COVID-19 for accurate results and ...

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    If you take an antigen test, which is an at-home test, a negative result may not always be accurate. “Positive results are very accurate and reliable,” the CDC said about antigen tests.

  5. Non-gonococcal urethritis - Wikipedia

    en.wikipedia.org/wiki/Non-gonococcal_urethritis

    It has been easy to test for the presence of gonorrhea by viewing a Gram stain of the urethral discharge under a microscope: The causative organism is distinctive in appearance; however, this works only with men because other non-pathogenic gram-negative microbes are present as normal flora of the vagina in women. Thus, one of the major causes ...

  6. Gonococcemia - Wikipedia

    en.wikipedia.org/wiki/Gonococcemia

    Gonococcemia (also known as "Disseminated gonococcal infection" [1]) is a rare complication of mucosal Neisseria gonorrhoeae infection, or Gonorrhea, that occurs when the bacteria invade the bloodstream. [2] It is characterized by fever, tender hemorrhagic pustules on the extremities or the trunk, migratory polyarthritis, and tenosynovitis. [3]

  7. Likelihood ratios in diagnostic testing - Wikipedia

    en.wikipedia.org/wiki/Likelihood_ratios_in...

    In fact, post-test probability, as estimated from the likelihood ratio and pre-test probability, is generally more accurate than if estimated from the positive predictive value of the test, if the tested individual has a different pre-test probability than what is the prevalence of that condition in the population.

  8. Why you have COVID symptoms and a negative test: You ... - AOL

    www.aol.com/finance/why-covid-symptoms-negative...

    If you still test negative, wait 48 more hours and test for a final time. In both cases, if you’d rather not wait, you can obtain a PCR, or polymerase chain reaction, test at a doctor’s office.

  9. COVID-19 rapid antigen test - Wikipedia

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

    The test, authorized for use without a prescription, is for use by individuals experiencing respiratory symptoms and uses a nasal swab sample to deliver at-home results in approximately 15 minutes for COVID-19 and influenza (flu). [95] The test detects proteins from both SARS-CoV-2 (the virus that causes COVID-19) and influenza A and B (the ...