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At this stage of the pandemic, medical experts agree thatGet COVID tests made quickly Is essential to keep the epidemics at the bay. The test results help doctors and officials to spot new cases and isolate patients before they can spread the disease. This is why disease control and prevention centers (CDC) had recommended thatAnyone who has tested positive for COVID-19 should self-isolate until they end up testing negative for the virus not once, butof them times. But recently, the CDC announced that patients can nowend their isolation 10 days after leaving the symptoms, without the need for negative test results. So, what is the reasoning behind the change of directive CDC insulation? Well, everything depends on the details of the test process, saysJohn Brooks, MD, chief doctor of COVID-19 response from CDC.

The most common COVID tests are reaction tests for the polymerase chain (PCR). TheThe PCR test is "generally very precise", " According to the Food and Drug Administration (FDA), but it is also very sensitive, that is to say aThe test could always come back positive For someone who was sick but then recovered.

When calling the recent press, Brooks said that "most people stop losing virus living after 10 days", which means they are no longer infectious. However, Brooks said: "They can continue to lose dead parts of the virus that this PCR test can discover."

Brooks explained that if this sensitivity leads to an effective test in the early stages of the disease before people get sick, they can actually have unexpected consequences for people who already know they have already Covid-19.

"He is brought to people who are not kept at work [or] kept at home when they do not need to be," Brooks noted. As a result, he said, "We have stopped recommending a PCR test for the diagnosis once you have recovered."

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Another reason behind theChange of directive CDC insulation Is the increased understanding of the agency an understanding of the period during which CVIV-19 patients are the most contagious. According to a recent report published by the CDC, about half of the coronavirus cases arespread during the pre-symptomatic phase, that is, before the patient's symptoms develop. And while some patients recovered can still "pour the SARS-COV-2 RNA detectable in upper respiratory specimens" up to three months, CDC notes, the concentration of viruses is so low that it makes the transmission of The disease "unlikely". And for more CDC guidelines, see50 security tips Covid essentials the CDC wants you to know.

Sarah Crow contributed to a report on this article.