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A player is more likely coronavirus SARS-CoV-2 to transmit before the fifth day from the start of symptoms According to a new British scientific study, which confirms that a person is most contagious in the early stages of Covid-19 infection, when they usually have a higher viral load.
Therefore, according to scientists, the timely isolation of those infected is crucial. Previous research has found that people are most contagious a day or two before symptoms appear. In combination with the new study, the first week of infection appears to be the most dangerous for transmission.
The virus, according to the new study, appears “alive” and capable of reproducing and transmitting itself for up to about nine days after the onset of symptoms. However, the exact degree of infection depends on many factors, such as individual viral load.
The researchers, led by Dr Mage Cevik from the University of St Andrews in Scotland, published in the medical journal The Lancet Microbe, according to the BBC, evaluated (systematic review and meta-analysis) 79 international studies of the disease. Covid-19, which involved a total of 5,340 symptomatic patients in hospitals.
It was found, after taking samples from patients, that it is possible to isolate and reproduce the viable coronavirus up to nine days after the onset of infection. The peak of the number of viral RNA particles (genetic material of the coronavirus) in the throat of patients and, therefore, of the viral load and transmissibility to others, occurs on the fifth day after the onset of symptoms.
Inactive sections of coronavirus RNA were found in samples from the throat and nose of patients on average up to 17 days after the onset of symptoms. The longest detection period for the virus in the upper respiratory tract was 83 days, in the lower respiratory tract 59 days, in blood 60 days, and in feces 126 days. The researchers estimate that despite this presence, because no viable and reproducible coronavirus was detected beyond the ninth day of the first symptoms, it is unlikely that most patients will be contagious after about nine days of infection. .
“People need to be isolated as soon as possible after the first symptoms, no matter how mild.” By the time they get the result of a test that they have done, they may have been through their most contagious phase, “said Dr. Cevik.
The study did not look at asymptomatic carriers of the coronavirus, but as other studies have shown, these people can transmit the virus.
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