PMC:7170415 / 13875-15142 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7170415","sourcedb":"PMC","sourceid":"7170415","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7170415","text":"The current diagnostic strategy recommended by the CDC to identify patients with COVID-19 is to test samples taken from the respiratory tract to assess for the presence of 1 or several nucleic acid targets specific to SARS–CoV-2 (25). A nasopharyngeal specimen is the preferred choice for swab-based SARS–CoV-2 testing, but oropharyngeal, mid-turbinate, or anterior nares samples also are acceptable (31, 32). Samples should be obtained by using a flocked swab, if available, to enhance the collection and release of cellular material. Swabs with an aluminum or plastic shaft are preferred. Swabs that contain calcium alginate, wood, or cotton should be avoided, because they may contain substances that inhibit PCR testing. Ideally, swabs should be transferred into universal transport medium immediately after sample collection to preserve viral nucleic acid. Samples taken from sputum, endotracheal aspirates, and bronchoalveolar lavage also may be sent directly to the microbiology laboratory for processing, and may have greater sensitivity than upper respiratory tract specimens (33). Inadequate sample collection may result in a false-negative test. After specimen collection, samples undergo RNA extraction followed by qualitative RT-PCR for target 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