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  Indian J Med Microbiol
 

Figure 1: Difference plot of Ct values of swab (NPS and OPS) versus gargle samples in sample pairs for N1 and N2 targets (A and B, respectively). Gargle samples are comparable to the paired swab samples as a method for respiratory sample collection. However, Ctvalues of the gargle samples were higher than that of the swab, as indicated by the line of mean difference (bias of −2.295 for target N1 and −2.528 for target N2). The dotted lines represent upper and lower limits of agreement (LOA).

Figure 1: Difference plot of C<sub>t </sub>values of swab (NPS and OPS) versus gargle samples in sample pairs for N1 and N2 targets (<b>A</b> and <b>B,</b> respectively). Gargle samples are comparable to the paired swab samples as a method for respiratory sample collection. However, C<sub>t</sub>values of the gargle samples were higher than that of the swab, as indicated by the line of mean difference (bias of −2.295 for target N1 and −2.528 for target N2). The dotted lines represent upper and lower limits of agreement (LOA).