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abstractpubmed· Abstract 2020· item PMID:32861337

Low Utility of Repeat Real-Time PCR Testing for SARS-CoV-2 in Clinical Specimens. In a multicenter cohort of 22,315 patients tested for COVID-19, 1676 (7.5%) had repeat testing via real-time polymerase chain reaction following an initial negative test. Of those retested within 7 days of their first negative test, only 2.0% had a positive result. This suggests that repeat testing from the same source is unlikely to provide additional information.