"In most cases, a negative result of PCR diagnostics for the presence of the virus indicates that the patient is no longer contagious," RIA Novosti quoted Ruzhentsova as saying.
According to her, the probability of false negative tests is now minimized.
Earlier, the director of the Gamaleya National Research Center for Epidemiology and Microbiology, Alexander Gintsburg, announced the creation of a test for a fake vaccination certificate.