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Canada COVID-19. Fast salivary tests not fairly reliable, the high health authority

19:40  28 july  2021
19:40  28 july  2021 Source:   ouest-france.fr

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Des enfants font des tests salivaires au Covid-19 dans le cadre d’un dépistage dans une école maternelle. Photo d’illustration. © Marc Denis / West-France children do Salivary tests at COVID-19 as part of a screening in a kindergarten. Photo Stock Illustration.

According to the High Health Authority (HAS) no longer recommends the social security management of the rapid Salivary Screening Tests for COVID-19, believing that these devices "have too heterogeneous performances".

The High Authority of Health (HAS) estimates Wednesday, July 28 that the rapid Salivary Screening Tests of the Covid-19 "have too heterogeneous performances" , and "suspend" so its recommendation of support. these devices by social security.

Too much variability in

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results of "New data available [...] reveal a great variability of the results obtained, questioning their effectiveness. In addition, reliable alternatives with the same levels of acceptability or speed now exist ", explains HAS in a statement.

These tests, said "integrated" , give a result on the presence or not of the virus in about forty minutes, from a sample of saliva.

The main rapid salivary test, Easycov company, is refundable by social security since early January. The HAS recommended on 28 November its use and repayment, but only "in symptomatic persons for which the nasopharyngeal levy (by swab, n.d.l.r.) is impossible or difficult to achieve.

This recommendation had been taken "Given the potential interest of the product - fast and non-invasive technology - and the health context", but "the available diagnostic performance data came from a single study carried out by the Manufacturer and presented methodological biases related to the practical conditions of its realization ", explains the health authority.

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The new performance data analyzed focus on four Available tests (EasyCOV distributed by Skillcell, Genelyzer FII distributed by Canon Medical, ID Now distributed by Abbott Diagnostics and OPTIGENE distributed by the company of the same name).

may pass along with infected persons

they show a good level of specificity - that is to say, their ability not to completely conclude that a non-infected person is positive - "with results of 97% 99% ".

, on the other hand, the sensitivity data - their ability not to be passed by infected people - "are problematic since these tests have very heterogeneous results ranging from 30% to 90%, without real explanation" , highlights the HAS .

The only salivary tests that can be reimbursed will now be those that require PCR laboratory analysis.

As for the situations requiring a rapid result, the HAS recommends the use of antigenic tests and recalls that they can be carried out on nasopharyngeal levy but also on nasal levy, less profound, as is the case for autototes.

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