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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.
People with the COVID-19 infection may have different symptoms, and their symptoms may change over time. Three common clusters of symptoms have been identified: a respiratory symptom cluster with cough, sputum , shortness of breath , and fever; a musculoskeletal symptom cluster with muscle and joint pain, headache, and fatigue; and a cluster of ...
The most recent COVID-19 vaccine should offer protection against the XEC variant, Russo says. “The most recent version of the vaccine seems to be reasonably well-matched,” he says.
The only sure-fire way to know the difference is by taking a PCR test that can test for both viruses at the same time, or by taking separate flu and COVID-19 tests.
Beginning in May 2020, a random sample of users is selected (on the first day they report symptoms) for a swab test. [9] Researchers then use statistical analysis to determine which symptoms are likely to indicate COVID-19, [17] rather than the common cold or seasonal influenza. [2] The app does not have any contact tracing functionality. [5]
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 ...
If your symptoms worsen instead of improve over time. Additionally, if you think your chest congestion is chronic and you don’t know why you have it, or if it’s associated with an infection ...
SARS-CoV-2 antigens can be detected before onset of COVID-19 symptoms (as soon as SARS-CoV-2 virus particles) with more rapid test results, but with less sensitivity than PCR tests for the virus. [57] COVID-19 rapid antigen tests are lateral flow immunoassays that detect the presence of a specific viral antigen, which indicates current viral ...