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Coronavirus disease (COVID-19) is an infectious disease caused by the SARS-CoV-2 virus. Most people infected with the virus will experience mild to moderate respiratory illness and recover without requiring special treatment. However, some will become seriously ill and require medical attention.
12 maj 2020 · Interpreting the result of a test for covid-19 depends on two things: the accuracy of the test, and the pre-test probability or estimated risk of disease before testing. A positive RT-PCR test for covid-19 test has more weight than a negative test because of the test’s high specificity but moderate sensitivity.
Patients undergoing asymptomatic screening have a pretest probability of COVID-19 that mirrors local prevalence. Thus, at the time of testing in this patient, the pretest probability of COVID-19 was approximately 0.35% (7-day cumulative average [0.07%] multiplied 5-fold to account for undertesting).
22 cze 2021 · When the disease incidence is low, a positive result should be validated by a polymerase chain reaction (PCR) test. However, if your clinical opinion is that covid-19 is likely, then a positive test is likely to be reliable.
14 cze 2021 · COVID-19 was correctly diagnosed based on CT thorax in 89.9% of patients with COVID-19 and incorrectly identified in 38% of patients who did not have COVID-19. The sensitivity of CXR ranged between 57–89%, while false-positive results ranged between 11–89% of patients without COVID-19.
19 lut 2022 · Molecular test, antigen rapid detection test, and antibody test. To establish a late or retrospective diagnosis by using antibody tests if molecular and antigen rapid tests are both negative. Can provide results in 15–20 min if a rapid antibody test or within 24 h if a laboratory-based assay.
28 mar 2023 · Questions and answers / Coronavirus disease (COVID-19) 28 March 2023 | Q&A. WHO is continuously monitoring and responding to this pandemic. This questions and answers page will be updated as more is known about COVID-19, how it spreads and how it is affecting people worldwide.
