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the double negative buffer is useless, for this very reason a group of experts, including Guido Silvestri, virologist and professor at Emory University in Atlanta (USA) and Paolo Spada, vascular surgeon at Humanitas Hospital in Milan, asks the government and the Scientific Technical Committee of abandon this procedure.
Specifically, Silvestri asks the Executive to comply with directives of the World Health Organization, reducing the period of illness due to COVID to 10 days and abandoning the execution of the control panel. In fact, today a person is considered positive until they get a double failure to hyssop, as reported by the Corriere della Sera.
The double negative swab is useless
For Silvestri there would be no reason to perform the negative swab twice, but on the contrary this practice also has some impact in three aspects: the People’s lives, l ‘economy and the public health. The WHO initially recommended double swab, but this practice was gradually abandoned. In addition, according to the Organization, the contagion begins Two days before symptoms appear and then gradually diminish until disappear after 10 days. Swab positivity, on the other hand, can last a long time, up to 4 months, even though the person cannot transmit the virus.
The attractiveness of the group of experts is based mainly on three reasons, specifically the execution of the double swab has serious repercussions on the lives of positive people, who must stay isolated even if they are no longer positive for the coronavirus. Second, the double mattress also has an impact on the economy, as often the persons in solitary confinement cannot participate in the Laboral life and production of the country. Finally, the third motivation refers to public health, since the fear of being isolated could act as a deterrent for people to report any symptoms.
The alternatives to double buffering
Double negative swabs were advanced diverse alternative by some experts. Last July Mario Clerici, Professor of Immunology at the University of Milan and Scientific Director of the Don Gnocchi Foundation, proposed to perform a single swab or from wait 7 days by the disappearance of symptoms instead of 3 as proposed by the WHO, explaining that “After a week the response mediated by antibodies, T lymphocytes and innate immunity takes over”.
For those who continue to test positive on the swab test, but with a low viral load, the subject is likely alone genome traces, but that it is no longer contagious. To ensure this, the San Matteo Hospital in Pavia has developed a test able to define if a person is always contagious or not. This is a laboratory test that verifies the degree of replicability of the virus. In a study conducted in 280 patients It has been shown that only the 3% were able to infect.
