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118, swabs do not always detect Sars-CoV2

2020-05-14T10:59:07.247Z


Tampons do not always manage to document reality. From daily medical experience, more and more patients with clinically diagnosed pneumonia emerge who are negative with two successive swabs. (HANDLE)


Tampons do not always manage to document reality. From daily medical experience, more and more patients with clinically diagnosed pneumonia emerge who are negative with two successive swabs. As for example in the story of the 41-year-old man who died in Chiavari in Liguria on April 27th from Covid-19 pneumonia not evidenced by the tests.

Numerically even more evident are the cases reported by the national president of SIS 118 Mario Balzanelli, head of the Covid-19 Station of SET 118 in Taranto (where all the suspect patients of the province come together): "About 50 patients, precisely 45 out of 100 were two-pad negative despite having the disease, "he says," when we took them over they had the clinical symptoms and the radiological picture of interstitial-alveolar pneumonia from Covid-19, diagnosed with CT scan of the chest that gave exactly the image ' to frosted glass' of the virus ".

In the last month and a half, the Covid-19 Station of 118 in the Apulian city has treated 283 suspected cases, of which 74.2% had symptoms compatible with the disease but tested negative both in buffer and Tac. In 50 (13%) they were positive for both buffer and Tac, while 12% were positive for Tac but not for buffer. "It is clear that swabs may not detect positivity, this data emerges from our experience and the number is decidedly high - says Balzanelli - which leads us to believe that the current number of positive for the disease is very underestimated. And if about 50 patients out of 100 (positive) were negative with two swabs despite having the disease, this means that practically half of the infected escape the contagion accounting ".

For the president of 118, in short, it must be clear: "There is no certainty about the real spread of the Sars-CoV-2 infection in our population since the number of infections is directly proportional to the number of swabs performed. Which in turn, it is enormously lower than the need to carry out mass screening of the population aimed at identifying the highly infectious asymptomatic or paucisymptomatic positives, which are the 'key' evaluation element to be taken into consideration ". The president of 118 added that in some cases, "traces of the virus were identified later through the bronchoscopic examination carried out in pulmonology, proving that the negative outcome of the swab is not indicative:" According to the tests carried out with pulmonologists, therefore we are led to say that Covid should be looked for down to the bronchi and not only on the surface ". In this regard, the guidelines of the Italian Society of Anesthesia and Resuscitation (Siaarti) and the Italian Association of Hospital Pulmonologists clarify that if the test is negative in suspect patients, "the samples must be collected from multiple sites in the respiratory tract", ie from the lower respiratory tract.

Source: ansa

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