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. 2022 Jul 27;13:912138. doi: 10.3389/fmicb.2022.912138

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Copyright © 2022 Corrêa, Faffe, Galliez, Gonçalves, Maia, da Silva, Moreira, Mariani, Campos, Leitão, de Souza, Cunha, Nascimento, Ribeiro, da Cruz, Policarpo, Gonzales, Rodgers, Berg, Vijesurier, Cloherty, Hackett Jr., Ferreira Jr., Castiñeiras, Tanuri and da Costa.

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Discordant samples (RT-PCR+/Ag-RDT-) showed higher C_t values than concordant ones (RT-PCR+/Ag-RDT+). (A) C_t values (N1 target) of SARS-CoV-2 RT-PCR in patients with a positive (n = 1,539) or negative (n = 293) nasopharyngeal antigen (Ag) rapid diagnostic test (RDT) result tested from August 2020 to September 2021. (B–D) Correlation between C_t value (N1 target) of SARS-CoV-2 RT-PCR and days since symptom onset (DSSO) when samples were collected in total patients (B), and among patients with a positive or negative Ag-RDT result (C,D, respectively).