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A recent report of the disease control and prevention centers (CDC) estimated that 40% of all coronavirus transmissions occur frompeople who do not show any symptoms. It's either because they are asymptomatic or because they are pre-symptomatic (which means that their symptoms have not yet surface). So, that begs some very complicated questions when it comes toCOVID-19 test: How do you knowWhen tested for coronavirus? And can you trust the results?

Emily Landon, MD, aEpidemiologist and Infectious Disease Specialist Medicine at the University of Chicago, told NPR thattCOVID-19 CONTAGION takes at least three to five days after exposure to the positive test. Given the lack of reliability for the results "A negative test should not be seen as your ticket To stop being careful, "the output reports.

"We do not know the quality of these tests in people who do not have symptoms," explained Landon. "We know they are rather good to pick up Covid when present in people who have symptoms. But we have no idea what a negative test means in an individual who has no symptoms. "

In addition, some people canpositive test, then negative, then positive again. "Hospitals often test people with symptoms twice to try to be safer from the conclusion," reports NPR.

Early in the propagation of coronavirus, theserious lack of tests has become a challenge to try to stop the spread of COVID-19 and to learn about who was most likely. And now thatThe tests are more ubiquitous and widely available, the number of cases has been shot down, simply because of the sharp increase in the administrated tests. (To be clear, these tests are tests for the presence of the virus and not theAntibody tests This reveals the ability to repel COVID-19, although these tests are not fully reliable either.)

If you feel sick or have been in contact with a person with COVID-19, then by all means, let yourself be tested. But, as Note Landon, even if the test returns negative, there is no reason not to continue to be careful because you could very well wear the virus. And for more on those without symptoms, checkThat's why some people have coronavirus symptoms and others no.