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[This corrects the article DOI 10.1371/journal.pone.0245454.].[This corrects the article DOI 10.1371/journal.pone.0241921.].[This corrects the article DOI 10.1371/journal.pone.0245170.].We evaluated the diagnostic accuracy of two newly developed, point-of-care, rapid antigen tests (RATs) for detecting SARS-CoV-2, the AFIAS COVID-19 Ag and the ichromaTM COVID-19 Ag, and investigated antigen kinetics. A total of 200 serially collected nasopharyngeal (NP) specimens from 38 COVID-19 patients and 122 specimens from negative controls were anal