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And a study by members of the University of Oxford Medical Center and the University of the West of England found that there is a risk of what is known as a “false positive” due to the way people currently undergo the tests. Corona virus tests.
The researchers say: “This may lead to an overestimation of the current size of the epidemic, because most infected people are contagious for about a week, but the test result can be positive several weeks after infection.”
Scientists have conducted research in 25 studies related to the widely used Corona virus test known as “PCR” to find out if a person has the virus.
This test gives a positive or negative result, which scientists say simply answers yes or no, and does not specify the size of the virus and whether or not it is contagious.
And they found that “the tests were able to detect the effects of the genetic material of the virus for much longer than they remain infectious, which means that the person who tested positive may be infected with the virus, but not necessarily carry it.”
They added that “the genetic material discovered may be part of a killed virus, which has already been treated by the body’s immune system.”
Professor Carl Hengan, one of the study’s authors, told the journal “Spectator” that “rather than giving a yes or no result, the tests should have a cut-off point so that very small amounts of the virus do not lead to a positive result, thus reducing the possibility of false results. “
The new Corona virus has killed at least 869,000 people since it appeared in China last December, while infections surpassed the 26 million mark worldwide.
