How long will I test positive for COVID after having it?

After a positive test result, you may continue to test positive for some time after. You may continue to test positive on antigen tests for a few weeks after your initial positive. You may continue to test positive on NAATs for up to 90 days.

cdc.gov - COVID-19 Testing: What You Need to Know - CDC

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Types of Tests

Viral tests look for a current infection with SARS-CoV-2, the virus that causes COVID-19, by testing specimens from your nose or mouth. There are two main types of viral tests: nucleic acid amplification tests (NAATs) and antigen tests. In certain circumstances, one test type may be recommended over the other. All tests should be performed following FDA’s requirements. NAATs , such as PCR-based tests, are most often performed in a laboratory. They are typically the most reliable tests for people with or without symptoms. These tests detect viral genetic material, which may stay in your body for up to 90 days after you test positive. Therefore, you should not use a NAAT if you have tested positive in the last 90 days. , such as PCR-based tests, are most often performed in a laboratory. They are typically the most reliable tests for people with or without symptoms. These tests detect viral genetic material, which may stay in your body for up to 90 days after you test positive. Therefore, you should not use a NAAT if you have tested positive in the last 90 days. Antigen tests* are rapid tests which produce results in 15-30 minutes. They are less reliable than NAATs, especially for people who do not have symptoms. A single, negative antigen test result does not rule out infection. To best detect infection, a negative antigen test should be repeated at least 48 hours apart (known as serial testing). Sometimes a follow-up NAAT may be recommended to confirm an antigen test result. *Self-tests, or at-home tests, are usually antigen tests that can be taken anywhere without having to go to a specific testing site. Follow FDA and manufacturer’s instructions, including for the number of times you may need to test. Multiple negative test results increase the confidence that you are not infected with the virus that causes COVID-19. You can order free self-test kits at COVIDtests.gov or purchase tests online, in pharmacies, and retail stores. or purchase tests online, in pharmacies, and retail stores. You can also visit FDA’s website to see a list of authorized tests. to see a list of authorized tests. As noted in the labeling for authorized over-the-counter antigen tests: Negative results should be treated as presumptive (meaning that they are preliminary results). Negative results do not rule out SARS-CoV-2 infection and should not be used as the sole basis for treatment or patient management decisions, including infection control decisions. Please see FDA guidance on the use of at-home COVID-19 antigen tests.

About Self-Tests

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What are side effects of quercetin?

Common side effects of quercetin include: Headache (oral use) Numbness and tingling (oral use) Shortness of breath (intravenous use) Nausea and vomiting (intravenous use) Kidney damage (intravenous use greater than 945 mg/m2)

rxlist.com - Quercetin: Generic, Uses, Side Effects, Dosages ... - RxList

This document does not contain all possible side effects and others may occur. Check with your physician for additional information about side effects.

What Other Drugs Interact with Quercetin?

If your doctor has directed you to use this medication, your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor, health care provider, or pharmacist first.

Quercetin has no known severe interactions with other drugs.

Serious Interactions of quercetin include: everolimus topotecan

Quercetin has moderate interactions with at least 60 different drugs.

Mild interactions of quercetin include: alvimopan armodafinil ciprofloxacin fexofenadine fleroxacin gemifloxacin levofloxacin loratadine moxifloxacin norfloxacin ofloxacin This information does not contain all possible interactions or adverse effects. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share this information with your doctor and pharmacist. Check with your health care professional or doctor for additional medical advice, or if you have health questions, concerns, or for more information about this medicine.

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