We devised a model to interpret discordant SARS-CoV-2 test results. We estimate that, during March 2020-May 2022, a patient in the United States who received a positive rapid antigen test result followed by a negative nucleic acid test result had only a 15.4% (95% CI 0.6%-56.7%) chance of being infected.
Keywords: COVID-19; PCR; SARS; SARS-CoV-2; coronavirus; coronavirus disease; diagnostic test; rapid antigen test; respiratory infections; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.