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2021
It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.
PCR (polymerase chain reaction) is a highly accurate and sensitive method that determines the presence of SARS-CoV-2 virus RNA in the human body, its specificity is about 100%. WHO claims that only 5% of PCR tests give a false negative result in infected patients, and link their arguments with the conditions of transportation, storage of the selected samples, the availability of testing tests for sensitivity, the willingness of the patient to take a smear.