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. 2023 Dec 9;11(12):3267. doi: 10.3390/biomedicines11123267

Figure 4.

Figure 4

Positivity of the three rapid antigen tests (RATs) according to the cycle threshold (Ct) values of the corresponding rRT-PCR test for the same virus. The dot plots show the positive (left) and negative (right) results for rRT-PCR, and the dotted horizontal line indicates the cut-off values for RAT kits to define a positive result (values below the line are positive and values above the line are negative). (A) SARS-CoV-2, GenBody; (B) SARS-CoV-2, InstaView; (C) SARS-CoV-2, STANDARD Q; (D) FluA, GenBody; (E) FluA, InstaView; (F) FluA, STANDARD Q; (G) FluB, GenBody; (H) FluB, InstaView; (I) FluB, STANDARD Q. Abbreviations: Ct, cycle threshold; FluA, influenza A virus; FluB, influenza B virus; RAT, rapid antigen test; rRT-PCR, real-time reverse-transcription polymerase chain reaction; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.